lwip_snmp_mib2_ip.c

00001 /**
00002  * @file
00003  * Management Information Base II (RFC1213) IP objects and functions.
00004  */
00005 
00006 /*
00007  * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
00008  * All rights reserved.
00009  *
00010  * Redistribution and use in source and binary forms, with or without modification,
00011  * are permitted provided that the following conditions are met:
00012  *
00013  * 1. Redistributions of source code must retain the above copyright notice,
00014  *    this list of conditions and the following disclaimer.
00015  * 2. Redistributions in binary form must reproduce the above copyright notice,
00016  *    this list of conditions and the following disclaimer in the documentation
00017  *    and/or other materials provided with the distribution.
00018  * 3. The name of the author may not be used to endorse or promote products
00019  *    derived from this software without specific prior written permission.
00020  *
00021  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
00022  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
00023  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
00024  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
00025  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
00026  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
00027  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
00028  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
00029  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
00030  * OF SUCH DAMAGE.
00031  *
00032  * Author: Dirk Ziegelmeier <dziegel@gmx.de>
00033  *         Christiaan Simons <christiaan.simons@axon.tv>
00034  */
00035 
00036 #include "lwip/snmp.h"
00037 #include "lwip/apps/snmp.h"
00038 #include "lwip/apps/snmp_core.h"
00039 #include "lwip/apps/snmp_mib2.h"
00040 #include "lwip/apps/snmp_table.h"
00041 #include "lwip/apps/snmp_scalar.h"
00042 #include "lwip/stats.h"
00043 #include "lwip/netif.h"
00044 #include "lwip/ip.h"
00045 #include "lwip/etharp.h"
00046 
00047 #if LWIP_SNMP && SNMP_LWIP_MIB2
00048 
00049 #if SNMP_USE_NETCONN
00050 #define SYNC_NODE_NAME(node_name) node_name ## _synced
00051 #define CREATE_LWIP_SYNC_NODE(oid, node_name) \
00052    static const struct snmp_threadsync_node node_name ## _synced = SNMP_CREATE_THREAD_SYNC_NODE(oid, &node_name.node, &snmp_mib2_lwip_locks);
00053 #else
00054 #define SYNC_NODE_NAME(node_name) node_name
00055 #define CREATE_LWIP_SYNC_NODE(oid, node_name)
00056 #endif
00057 
00058 #if LWIP_IPV4
00059 /* --- ip .1.3.6.1.2.1.4 ----------------------------------------------------- */
00060 
00061 static s16_t
00062 ip_get_value(struct snmp_node_instance *instance, void *value)
00063 {
00064   s32_t *sint_ptr = (s32_t *)value;
00065   u32_t *uint_ptr = (u32_t *)value;
00066 
00067   switch (instance->node->oid) {
00068     case 1: /* ipForwarding */
00069 #if IP_FORWARD
00070       /* forwarding */
00071       *sint_ptr = 1;
00072 #else
00073       /* not-forwarding */
00074       *sint_ptr = 2;
00075 #endif
00076       return sizeof(*sint_ptr);
00077     case 2: /* ipDefaultTTL */
00078       *sint_ptr = IP_DEFAULT_TTL;
00079       return sizeof(*sint_ptr);
00080     case 3: /* ipInReceives */
00081       *uint_ptr = STATS_GET(mib2.ipinreceives);
00082       return sizeof(*uint_ptr);
00083     case 4: /* ipInHdrErrors */
00084       *uint_ptr = STATS_GET(mib2.ipinhdrerrors);
00085       return sizeof(*uint_ptr);
00086     case 5: /* ipInAddrErrors */
00087       *uint_ptr = STATS_GET(mib2.ipinaddrerrors);
00088       return sizeof(*uint_ptr);
00089     case 6: /* ipForwDatagrams */
00090       *uint_ptr = STATS_GET(mib2.ipforwdatagrams);
00091       return sizeof(*uint_ptr);
00092     case 7: /* ipInUnknownProtos */
00093       *uint_ptr = STATS_GET(mib2.ipinunknownprotos);
00094       return sizeof(*uint_ptr);
00095     case 8: /* ipInDiscards */
00096       *uint_ptr = STATS_GET(mib2.ipindiscards);
00097       return sizeof(*uint_ptr);
00098     case 9: /* ipInDelivers */
00099       *uint_ptr = STATS_GET(mib2.ipindelivers);
00100       return sizeof(*uint_ptr);
00101     case 10: /* ipOutRequests */
00102       *uint_ptr = STATS_GET(mib2.ipoutrequests);
00103       return sizeof(*uint_ptr);
00104     case 11: /* ipOutDiscards */
00105       *uint_ptr = STATS_GET(mib2.ipoutdiscards);
00106       return sizeof(*uint_ptr);
00107     case 12: /* ipOutNoRoutes */
00108       *uint_ptr = STATS_GET(mib2.ipoutnoroutes);
00109       return sizeof(*uint_ptr);
00110     case 13: /* ipReasmTimeout */
00111 #if IP_REASSEMBLY
00112       *sint_ptr = IP_REASS_MAXAGE;
00113 #else
00114       *sint_ptr = 0;
00115 #endif
00116       return sizeof(*sint_ptr);
00117     case 14: /* ipReasmReqds */
00118       *uint_ptr = STATS_GET(mib2.ipreasmreqds);
00119       return sizeof(*uint_ptr);
00120     case 15: /* ipReasmOKs */
00121       *uint_ptr = STATS_GET(mib2.ipreasmoks);
00122       return sizeof(*uint_ptr);
00123     case 16: /* ipReasmFails */
00124       *uint_ptr = STATS_GET(mib2.ipreasmfails);
00125       return sizeof(*uint_ptr);
00126     case 17: /* ipFragOKs */
00127       *uint_ptr = STATS_GET(mib2.ipfragoks);
00128       return sizeof(*uint_ptr);
00129     case 18: /* ipFragFails */
00130       *uint_ptr = STATS_GET(mib2.ipfragfails);
00131       return sizeof(*uint_ptr);
00132     case 19: /* ipFragCreates */
00133       *uint_ptr = STATS_GET(mib2.ipfragcreates);
00134       return sizeof(*uint_ptr);
00135     case 23: /* ipRoutingDiscards: not supported -> always 0 */
00136       *uint_ptr = 0;
00137       return sizeof(*uint_ptr);
00138     default:
00139       LWIP_DEBUGF(SNMP_MIB_DEBUG, ("ip_get_value(): unknown id: %"S32_F"\n", instance->node->oid));
00140       break;
00141   }
00142 
00143   return 0;
00144 }
00145 
00146 /**
00147  * Test ip object value before setting.
00148  *
00149  * @param instance node instance
00150  * @param len return value space (in bytes)
00151  * @param value points to (varbind) space to copy value from.
00152  *
00153  * @note we allow set if the value matches the hardwired value,
00154  *   otherwise return badvalue.
00155  */
00156 static snmp_err_t
00157 ip_set_test(struct snmp_node_instance *instance, u16_t len, void *value)
00158 {
00159   snmp_err_t ret = SNMP_ERR_WRONGVALUE;
00160   s32_t *sint_ptr = (s32_t *)value;
00161 
00162   LWIP_UNUSED_ARG(len);
00163   switch (instance->node->oid) {
00164     case 1: /* ipForwarding */
00165 #if IP_FORWARD
00166       /* forwarding */
00167       if (*sint_ptr == 1)
00168 #else
00169       /* not-forwarding */
00170       if (*sint_ptr == 2)
00171 #endif
00172       {
00173         ret = SNMP_ERR_NOERROR;
00174       }
00175       break;
00176     case 2: /* ipDefaultTTL */
00177       if (*sint_ptr == IP_DEFAULT_TTL) {
00178         ret = SNMP_ERR_NOERROR;
00179       }
00180       break;
00181     default:
00182       LWIP_DEBUGF(SNMP_MIB_DEBUG, ("ip_set_test(): unknown id: %"S32_F"\n", instance->node->oid));
00183       break;
00184   }
00185 
00186   return ret;
00187 }
00188 
00189 static snmp_err_t
00190 ip_set_value(struct snmp_node_instance *instance, u16_t len, void *value)
00191 {
00192   LWIP_UNUSED_ARG(instance);
00193   LWIP_UNUSED_ARG(len);
00194   LWIP_UNUSED_ARG(value);
00195   /* nothing to do here because in set_test we only accept values being the same as our own stored value -> no need to store anything */
00196   return SNMP_ERR_NOERROR;
00197 }
00198 
00199 /* --- ipAddrTable --- */
00200 
00201 /* list of allowed value ranges for incoming OID */
00202 static const struct snmp_oid_range ip_AddrTable_oid_ranges[] = {
00203   { 0, 0xff }, /* IP A */
00204   { 0, 0xff }, /* IP B */
00205   { 0, 0xff }, /* IP C */
00206   { 0, 0xff }  /* IP D */
00207 };
00208 
00209 static snmp_err_t
00210 ip_AddrTable_get_cell_value_core (struct netif *netif, const u32_t *column, union snmp_variant_value *value, u32_t *value_len)
00211 {
00212   LWIP_UNUSED_ARG(value_len);
00213 
00214   switch (*column) {
00215     case 1: /* ipAdEntAddr */
00216       value->u32 = netif_ip4_addr(netif)->addr;
00217       break;
00218     case 2: /* ipAdEntIfIndex */
00219       value->u32 = netif_to_num(netif);
00220       break;
00221     case 3: /* ipAdEntNetMask */
00222       value->u32 = netif_ip4_netmask(netif)->addr;
00223       break;
00224     case 4: /* ipAdEntBcastAddr */
00225       /* lwIP oddity, there's no broadcast
00226          address in the netif we can rely on */
00227       value->u32 = IPADDR_BROADCAST & 1;
00228       break;
00229     case 5: /* ipAdEntReasmMaxSize */
00230 #if IP_REASSEMBLY
00231       /* @todo The theoretical maximum is IP_REASS_MAX_PBUFS * size of the pbufs,
00232        * but only if receiving one fragmented packet at a time.
00233        * The current solution is to calculate for 2 simultaneous packets...
00234        */
00235       value->u32 = (IP_HLEN + ((IP_REASS_MAX_PBUFS / 2) *
00236                                (PBUF_POOL_BUFSIZE - PBUF_LINK_ENCAPSULATION_HLEN - PBUF_LINK_HLEN - IP_HLEN)));
00237 #else
00238       /** @todo returning MTU would be a bad thing and
00239           returning a wild guess like '576' isn't good either */
00240       value->u32 = 0;
00241 #endif
00242       break;
00243     default:
00244       return SNMP_ERR_NOSUCHINSTANCE;
00245   }
00246 
00247   return SNMP_ERR_NOERROR;
00248 }
00249 
00250 static snmp_err_t
00251 ip_AddrTable_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)
00252 {
00253   ip4_addr_t ip;
00254   struct netif *netif;
00255 
00256   /* check if incoming OID length and if values are in plausible range */
00257   if (!snmp_oid_in_range(row_oid, row_oid_len, ip_AddrTable_oid_ranges, LWIP_ARRAYSIZE(ip_AddrTable_oid_ranges))) {
00258     return SNMP_ERR_NOSUCHINSTANCE;
00259   }
00260 
00261   /* get IP from incoming OID */
00262   snmp_oid_to_ip4(&row_oid[0], &ip); /* we know it succeeds because of oid_in_range check above */
00263 
00264   /* find netif with requested ip */
00265   NETIF_FOREACH(netif) {
00266     if (ip4_addr_cmp(&ip, netif_ip4_addr(netif))) {
00267       /* fill in object properties */
00268       return ip_AddrTable_get_cell_value_core (netif, column, value, value_len);
00269     }
00270   }
00271 
00272   /* not found */
00273   return SNMP_ERR_NOSUCHINSTANCE;
00274 }
00275 
00276 static snmp_err_t
00277 ip_AddrTable_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)
00278 {
00279   struct netif *netif;
00280   struct snmp_next_oid_state state;
00281   u32_t result_temp[LWIP_ARRAYSIZE(ip_AddrTable_oid_ranges)];
00282 
00283   /* init struct to search next oid */
00284   snmp_next_oid_init(&state, row_oid->id, row_oid->len, result_temp, LWIP_ARRAYSIZE(ip_AddrTable_oid_ranges));
00285 
00286   /* iterate over all possible OIDs to find the next one */
00287   NETIF_FOREACH(netif) {
00288     u32_t test_oid[LWIP_ARRAYSIZE(ip_AddrTable_oid_ranges)];
00289     snmp_ip4_to_oid(netif_ip4_addr(netif), &test_oid[0]);
00290 
00291     /* check generated OID: is it a candidate for the next one? */
00292     snmp_next_oid_check(&state, test_oid, LWIP_ARRAYSIZE(ip_AddrTable_oid_ranges), netif);
00293   }
00294 
00295   /* did we find a next one? */
00296   if (state.status == SNMP_NEXT_OID_STATUS_SUCCESS) {
00297     snmp_oid_assign(row_oid, state.next_oid, state.next_oid_len);
00298     /* fill in object properties */
00299     return ip_AddrTable_get_cell_value_core ((struct netif *)state.reference, column, value, value_len);
00300   }
00301 
00302   /* not found */
00303   return SNMP_ERR_NOSUCHINSTANCE;
00304 }
00305 
00306 /* --- ipRouteTable --- */
00307 
00308 /* list of allowed value ranges for incoming OID */
00309 static const struct snmp_oid_range ip_RouteTable_oid_ranges[] = {
00310   { 0, 0xff }, /* IP A */
00311   { 0, 0xff }, /* IP B */
00312   { 0, 0xff }, /* IP C */
00313   { 0, 0xff }, /* IP D */
00314 };
00315 
00316 static snmp_err_t
00317 ip_RouteTable_get_cell_value_core(struct netif *netif, u8_t default_route, const u32_t *column, union snmp_variant_value *value, u32_t *value_len)
00318 {
00319   switch (*column) {
00320     case 1: /* ipRouteDest */
00321       if (default_route) {
00322         /* default rte has 0.0.0.0 dest */
00323         value->u32 = IP4_ADDR_ANY4->addr;
00324       } else {
00325         /* netifs have netaddress dest */
00326         ip4_addr_t tmp;
00327         ip4_addr_get_network(&tmp, netif_ip4_addr(netif), netif_ip4_netmask(netif));
00328         value->u32 = tmp.addr;
00329       }
00330       break;
00331     case 2: /* ipRouteIfIndex */
00332       value->u32 = netif_to_num(netif);
00333       break;
00334     case 3: /* ipRouteMetric1 */
00335       if (default_route) {
00336         value->s32 = 1; /* default */
00337       } else {
00338         value->s32 = 0; /* normal */
00339       }
00340       break;
00341     case 4: /* ipRouteMetric2 */
00342     case 5: /* ipRouteMetric3 */
00343     case 6: /* ipRouteMetric4 */
00344       value->s32 = -1; /* none */
00345       break;
00346     case 7: /* ipRouteNextHop */
00347       if (default_route) {
00348         /* default rte: gateway */
00349         value->u32 = netif_ip4_gw(netif)->addr;
00350       } else {
00351         /* other rtes: netif ip_addr  */
00352         value->u32 = netif_ip4_addr(netif)->addr;
00353       }
00354       break;
00355     case 8: /* ipRouteType */
00356       if (default_route) {
00357         /* default rte is indirect */
00358         value->u32 = 4; /* indirect */
00359       } else {
00360         /* other rtes are direct */
00361         value->u32 = 3; /* direct */
00362       }
00363       break;
00364     case 9: /* ipRouteProto */
00365       /* locally defined routes */
00366       value->u32 = 2; /* local */
00367       break;
00368     case 10: /* ipRouteAge */
00369       /* @todo (sysuptime - timestamp last change) / 100 */
00370       value->u32 = 0;
00371       break;
00372     case 11: /* ipRouteMask */
00373       if (default_route) {
00374         /* default rte use 0.0.0.0 mask */
00375         value->u32 = IP4_ADDR_ANY4->addr;
00376       } else {
00377         /* other rtes use netmask */
00378         value->u32 = netif_ip4_netmask(netif)->addr;
00379       }
00380       break;
00381     case 12: /* ipRouteMetric5 */
00382       value->s32 = -1; /* none */
00383       break;
00384     case 13: /* ipRouteInfo */
00385       value->const_ptr = snmp_zero_dot_zero.id;
00386       *value_len = snmp_zero_dot_zero.len * sizeof(u32_t);
00387       break;
00388     default:
00389       return SNMP_ERR_NOSUCHINSTANCE;
00390   }
00391 
00392   return SNMP_ERR_NOERROR;
00393 }
00394 
00395 static snmp_err_t
00396 ip_RouteTable_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)
00397 {
00398   ip4_addr_t test_ip;
00399   struct netif *netif;
00400 
00401   /* check if incoming OID length and if values are in plausible range */
00402   if (!snmp_oid_in_range(row_oid, row_oid_len, ip_RouteTable_oid_ranges, LWIP_ARRAYSIZE(ip_RouteTable_oid_ranges))) {
00403     return SNMP_ERR_NOSUCHINSTANCE;
00404   }
00405 
00406   /* get IP and port from incoming OID */
00407   snmp_oid_to_ip4(&row_oid[0], &test_ip); /* we know it succeeds because of oid_in_range check above */
00408 
00409   /* default route is on default netif */
00410   if (ip4_addr_isany_val(test_ip) && (netif_default != NULL)) {
00411     /* fill in object properties */
00412     return ip_RouteTable_get_cell_value_core(netif_default, 1, column, value, value_len);
00413   }
00414 
00415   /* find netif with requested route */
00416   NETIF_FOREACH(netif) {
00417     ip4_addr_t dst;
00418     ip4_addr_get_network(&dst, netif_ip4_addr(netif), netif_ip4_netmask(netif));
00419 
00420     if (ip4_addr_cmp(&dst, &test_ip)) {
00421       /* fill in object properties */
00422       return ip_RouteTable_get_cell_value_core(netif, 0, column, value, value_len);
00423     }
00424   }
00425 
00426   /* not found */
00427   return SNMP_ERR_NOSUCHINSTANCE;
00428 }
00429 
00430 static snmp_err_t
00431 ip_RouteTable_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)
00432 {
00433   struct netif *netif;
00434   struct snmp_next_oid_state state;
00435   u32_t result_temp[LWIP_ARRAYSIZE(ip_RouteTable_oid_ranges)];
00436   u32_t test_oid[LWIP_ARRAYSIZE(ip_RouteTable_oid_ranges)];
00437 
00438   /* init struct to search next oid */
00439   snmp_next_oid_init(&state, row_oid->id, row_oid->len, result_temp, LWIP_ARRAYSIZE(ip_RouteTable_oid_ranges));
00440 
00441   /* check default route */
00442   if (netif_default != NULL) {
00443     snmp_ip4_to_oid(IP4_ADDR_ANY4, &test_oid[0]);
00444     snmp_next_oid_check(&state, test_oid, LWIP_ARRAYSIZE(ip_RouteTable_oid_ranges), netif_default);
00445   }
00446 
00447   /* iterate over all possible OIDs to find the next one */
00448   NETIF_FOREACH(netif) {
00449     ip4_addr_t dst;
00450     ip4_addr_get_network(&dst, netif_ip4_addr(netif), netif_ip4_netmask(netif));
00451 
00452     /* check generated OID: is it a candidate for the next one? */
00453     if (!ip4_addr_isany_val(dst)) {
00454       snmp_ip4_to_oid(&dst, &test_oid[0]);
00455       snmp_next_oid_check(&state, test_oid, LWIP_ARRAYSIZE(ip_RouteTable_oid_ranges), netif);
00456     }
00457   }
00458 
00459   /* did we find a next one? */
00460   if (state.status == SNMP_NEXT_OID_STATUS_SUCCESS) {
00461     ip4_addr_t dst;
00462     snmp_oid_to_ip4(&result_temp[0], &dst);
00463     snmp_oid_assign(row_oid, state.next_oid, state.next_oid_len);
00464     /* fill in object properties */
00465     return ip_RouteTable_get_cell_value_core((struct netif *)state.reference, ip4_addr_isany_val(dst), column, value, value_len);
00466   } else {
00467     /* not found */
00468     return SNMP_ERR_NOSUCHINSTANCE;
00469   }
00470 }
00471 
00472 #if LWIP_ARP && LWIP_IPV4
00473 /* --- ipNetToMediaTable --- */
00474 
00475 /* list of allowed value ranges for incoming OID */
00476 static const struct snmp_oid_range ip_NetToMediaTable_oid_ranges[] = {
00477   { 1, 0xff }, /* IfIndex */
00478   { 0, 0xff }, /* IP A    */
00479   { 0, 0xff }, /* IP B    */
00480   { 0, 0xff }, /* IP C    */
00481   { 0, 0xff }  /* IP D    */
00482 };
00483 
00484 static snmp_err_t
00485 ip_NetToMediaTable_get_cell_value_core(size_t arp_table_index, const u32_t *column, union snmp_variant_value *value, u32_t *value_len)
00486 {
00487   ip4_addr_t *ip;
00488   struct netif *netif;
00489   struct eth_addr *ethaddr;
00490 
00491   etharp_get_entry(arp_table_index, &ip, &netif, &ethaddr);
00492 
00493   /* value */
00494   switch (*column) {
00495     case 1: /* atIfIndex / ipNetToMediaIfIndex */
00496       value->u32 = netif_to_num(netif);
00497       break;
00498     case 2: /* atPhysAddress / ipNetToMediaPhysAddress */
00499       value->ptr = ethaddr;
00500       *value_len = sizeof(*ethaddr);
00501       break;
00502     case 3: /* atNetAddress / ipNetToMediaNetAddress */
00503       value->u32 = ip->addr;
00504       break;
00505     case 4: /* ipNetToMediaType */
00506       value->u32 = 3; /* dynamic*/
00507       break;
00508     default:
00509       return SNMP_ERR_NOSUCHINSTANCE;
00510   }
00511 
00512   return SNMP_ERR_NOERROR;
00513 }
00514 
00515 static snmp_err_t
00516 ip_NetToMediaTable_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)
00517 {
00518   ip4_addr_t ip_in;
00519   u8_t netif_index;
00520   size_t i;
00521 
00522   /* check if incoming OID length and if values are in plausible range */
00523   if (!snmp_oid_in_range(row_oid, row_oid_len, ip_NetToMediaTable_oid_ranges, LWIP_ARRAYSIZE(ip_NetToMediaTable_oid_ranges))) {
00524     return SNMP_ERR_NOSUCHINSTANCE;
00525   }
00526 
00527   /* get IP from incoming OID */
00528   netif_index = (u8_t)row_oid[0];
00529   snmp_oid_to_ip4(&row_oid[1], &ip_in); /* we know it succeeds because of oid_in_range check above */
00530 
00531   /* find requested entry */
00532   for (i = 0; i < ARP_TABLE_SIZE; i++) {
00533     ip4_addr_t *ip;
00534     struct netif *netif;
00535     struct eth_addr *ethaddr;
00536 
00537     if (etharp_get_entry(i, &ip, &netif, &ethaddr)) {
00538       if ((netif_index == netif_to_num(netif)) && ip4_addr_cmp(&ip_in, ip)) {
00539         /* fill in object properties */
00540         return ip_NetToMediaTable_get_cell_value_core(i, column, value, value_len);
00541       }
00542     }
00543   }
00544 
00545   /* not found */
00546   return SNMP_ERR_NOSUCHINSTANCE;
00547 }
00548 
00549 static snmp_err_t
00550 ip_NetToMediaTable_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)
00551 {
00552   size_t i;
00553   struct snmp_next_oid_state state;
00554   u32_t result_temp[LWIP_ARRAYSIZE(ip_NetToMediaTable_oid_ranges)];
00555 
00556   /* init struct to search next oid */
00557   snmp_next_oid_init(&state, row_oid->id, row_oid->len, result_temp, LWIP_ARRAYSIZE(ip_NetToMediaTable_oid_ranges));
00558 
00559   /* iterate over all possible OIDs to find the next one */
00560   for (i = 0; i < ARP_TABLE_SIZE; i++) {
00561     ip4_addr_t *ip;
00562     struct netif *netif;
00563     struct eth_addr *ethaddr;
00564 
00565     if (etharp_get_entry(i, &ip, &netif, &ethaddr)) {
00566       u32_t test_oid[LWIP_ARRAYSIZE(ip_NetToMediaTable_oid_ranges)];
00567 
00568       test_oid[0] = netif_to_num(netif);
00569       snmp_ip4_to_oid(ip, &test_oid[1]);
00570 
00571       /* check generated OID: is it a candidate for the next one? */
00572       snmp_next_oid_check(&state, test_oid, LWIP_ARRAYSIZE(ip_NetToMediaTable_oid_ranges), LWIP_PTR_NUMERIC_CAST(void *, i));
00573     }
00574   }
00575 
00576   /* did we find a next one? */
00577   if (state.status == SNMP_NEXT_OID_STATUS_SUCCESS) {
00578     snmp_oid_assign(row_oid, state.next_oid, state.next_oid_len);
00579     /* fill in object properties */
00580     return ip_NetToMediaTable_get_cell_value_core(LWIP_PTR_NUMERIC_CAST(size_t, state.reference), column, value, value_len);
00581   }
00582 
00583   /* not found */
00584   return SNMP_ERR_NOSUCHINSTANCE;
00585 }
00586 
00587 #endif /* LWIP_ARP && LWIP_IPV4 */
00588 
00589 static const struct snmp_scalar_node ip_Forwarding      = SNMP_SCALAR_CREATE_NODE(1, SNMP_NODE_INSTANCE_READ_WRITE, SNMP_ASN1_TYPE_INTEGER, ip_get_value, ip_set_test, ip_set_value);
00590 static const struct snmp_scalar_node ip_DefaultTTL      = SNMP_SCALAR_CREATE_NODE(2, SNMP_NODE_INSTANCE_READ_WRITE, SNMP_ASN1_TYPE_INTEGER, ip_get_value, ip_set_test, ip_set_value);
00591 static const struct snmp_scalar_node ip_InReceives      = SNMP_SCALAR_CREATE_NODE_READONLY(3, SNMP_ASN1_TYPE_COUNTER, ip_get_value);
00592 static const struct snmp_scalar_node ip_InHdrErrors     = SNMP_SCALAR_CREATE_NODE_READONLY(4, SNMP_ASN1_TYPE_COUNTER, ip_get_value);
00593 static const struct snmp_scalar_node ip_InAddrErrors    = SNMP_SCALAR_CREATE_NODE_READONLY(5, SNMP_ASN1_TYPE_COUNTER, ip_get_value);
00594 static const struct snmp_scalar_node ip_ForwDatagrams   = SNMP_SCALAR_CREATE_NODE_READONLY(6, SNMP_ASN1_TYPE_COUNTER, ip_get_value);
00595 static const struct snmp_scalar_node ip_InUnknownProtos = SNMP_SCALAR_CREATE_NODE_READONLY(7, SNMP_ASN1_TYPE_COUNTER, ip_get_value);
00596 static const struct snmp_scalar_node ip_InDiscards      = SNMP_SCALAR_CREATE_NODE_READONLY(8, SNMP_ASN1_TYPE_COUNTER, ip_get_value);
00597 static const struct snmp_scalar_node ip_InDelivers      = SNMP_SCALAR_CREATE_NODE_READONLY(9, SNMP_ASN1_TYPE_COUNTER, ip_get_value);
00598 static const struct snmp_scalar_node ip_OutRequests     = SNMP_SCALAR_CREATE_NODE_READONLY(10, SNMP_ASN1_TYPE_COUNTER, ip_get_value);
00599 static const struct snmp_scalar_node ip_OutDiscards     = SNMP_SCALAR_CREATE_NODE_READONLY(11, SNMP_ASN1_TYPE_COUNTER, ip_get_value);
00600 static const struct snmp_scalar_node ip_OutNoRoutes     = SNMP_SCALAR_CREATE_NODE_READONLY(12, SNMP_ASN1_TYPE_COUNTER, ip_get_value);
00601 static const struct snmp_scalar_node ip_ReasmTimeout    = SNMP_SCALAR_CREATE_NODE_READONLY(13, SNMP_ASN1_TYPE_INTEGER, ip_get_value);
00602 static const struct snmp_scalar_node ip_ReasmReqds      = SNMP_SCALAR_CREATE_NODE_READONLY(14, SNMP_ASN1_TYPE_COUNTER, ip_get_value);
00603 static const struct snmp_scalar_node ip_ReasmOKs        = SNMP_SCALAR_CREATE_NODE_READONLY(15, SNMP_ASN1_TYPE_COUNTER, ip_get_value);
00604 static const struct snmp_scalar_node ip_ReasmFails      = SNMP_SCALAR_CREATE_NODE_READONLY(16, SNMP_ASN1_TYPE_COUNTER, ip_get_value);
00605 static const struct snmp_scalar_node ip_FragOKs         = SNMP_SCALAR_CREATE_NODE_READONLY(17, SNMP_ASN1_TYPE_COUNTER, ip_get_value);
00606 static const struct snmp_scalar_node ip_FragFails       = SNMP_SCALAR_CREATE_NODE_READONLY(18, SNMP_ASN1_TYPE_COUNTER, ip_get_value);
00607 static const struct snmp_scalar_node ip_FragCreates     = SNMP_SCALAR_CREATE_NODE_READONLY(19, SNMP_ASN1_TYPE_COUNTER, ip_get_value);
00608 static const struct snmp_scalar_node ip_RoutingDiscards = SNMP_SCALAR_CREATE_NODE_READONLY(23, SNMP_ASN1_TYPE_COUNTER, ip_get_value);
00609 
00610 static const struct snmp_table_simple_col_def ip_AddrTable_columns[] = {
00611   { 1, SNMP_ASN1_TYPE_IPADDR,  SNMP_VARIANT_VALUE_TYPE_U32 }, /* ipAdEntAddr */
00612   { 2, SNMP_ASN1_TYPE_INTEGER, SNMP_VARIANT_VALUE_TYPE_U32 }, /* ipAdEntIfIndex */
00613   { 3, SNMP_ASN1_TYPE_IPADDR,  SNMP_VARIANT_VALUE_TYPE_U32 }, /* ipAdEntNetMask */
00614   { 4, SNMP_ASN1_TYPE_INTEGER, SNMP_VARIANT_VALUE_TYPE_U32 }, /* ipAdEntBcastAddr */
00615   { 5, SNMP_ASN1_TYPE_INTEGER, SNMP_VARIANT_VALUE_TYPE_U32 }  /* ipAdEntReasmMaxSize */
00616 };
00617 
00618 static const struct snmp_table_simple_node ip_AddrTable = SNMP_TABLE_CREATE_SIMPLE(20, ip_AddrTable_columns, ip_AddrTable_get_cell_value, ip_AddrTable_get_next_cell_instance_and_value);
00619 
00620 static const struct snmp_table_simple_col_def ip_RouteTable_columns[] = {
00621   {  1, SNMP_ASN1_TYPE_IPADDR,    SNMP_VARIANT_VALUE_TYPE_U32 }, /* ipRouteDest */
00622   {  2, SNMP_ASN1_TYPE_INTEGER,   SNMP_VARIANT_VALUE_TYPE_U32 }, /* ipRouteIfIndex */
00623   {  3, SNMP_ASN1_TYPE_INTEGER,   SNMP_VARIANT_VALUE_TYPE_S32 }, /* ipRouteMetric1 */
00624   {  4, SNMP_ASN1_TYPE_INTEGER,   SNMP_VARIANT_VALUE_TYPE_S32 }, /* ipRouteMetric2 */
00625   {  5, SNMP_ASN1_TYPE_INTEGER,   SNMP_VARIANT_VALUE_TYPE_S32 }, /* ipRouteMetric3 */
00626   {  6, SNMP_ASN1_TYPE_INTEGER,   SNMP_VARIANT_VALUE_TYPE_S32 }, /* ipRouteMetric4 */
00627   {  7, SNMP_ASN1_TYPE_IPADDR,    SNMP_VARIANT_VALUE_TYPE_U32 }, /* ipRouteNextHop */
00628   {  8, SNMP_ASN1_TYPE_INTEGER,   SNMP_VARIANT_VALUE_TYPE_U32 }, /* ipRouteType */
00629   {  9, SNMP_ASN1_TYPE_INTEGER,   SNMP_VARIANT_VALUE_TYPE_U32 }, /* ipRouteProto */
00630   { 10, SNMP_ASN1_TYPE_INTEGER,   SNMP_VARIANT_VALUE_TYPE_U32 }, /* ipRouteAge */
00631   { 11, SNMP_ASN1_TYPE_IPADDR,    SNMP_VARIANT_VALUE_TYPE_U32 }, /* ipRouteMask */
00632   { 12, SNMP_ASN1_TYPE_INTEGER,   SNMP_VARIANT_VALUE_TYPE_S32 }, /* ipRouteMetric5 */
00633   { 13, SNMP_ASN1_TYPE_OBJECT_ID, SNMP_VARIANT_VALUE_TYPE_PTR }  /* ipRouteInfo */
00634 };
00635 
00636 static const struct snmp_table_simple_node ip_RouteTable = SNMP_TABLE_CREATE_SIMPLE(21, ip_RouteTable_columns, ip_RouteTable_get_cell_value, ip_RouteTable_get_next_cell_instance_and_value);
00637 #endif /* LWIP_IPV4 */
00638 
00639 #if LWIP_ARP && LWIP_IPV4
00640 static const struct snmp_table_simple_col_def ip_NetToMediaTable_columns[] = {
00641   {  1, SNMP_ASN1_TYPE_INTEGER,      SNMP_VARIANT_VALUE_TYPE_U32 }, /* ipNetToMediaIfIndex */
00642   {  2, SNMP_ASN1_TYPE_OCTET_STRING, SNMP_VARIANT_VALUE_TYPE_PTR }, /* ipNetToMediaPhysAddress */
00643   {  3, SNMP_ASN1_TYPE_IPADDR,       SNMP_VARIANT_VALUE_TYPE_U32 }, /* ipNetToMediaNetAddress */
00644   {  4, SNMP_ASN1_TYPE_INTEGER,      SNMP_VARIANT_VALUE_TYPE_U32 }  /* ipNetToMediaType */
00645 };
00646 
00647 static const struct snmp_table_simple_node ip_NetToMediaTable = SNMP_TABLE_CREATE_SIMPLE(22, ip_NetToMediaTable_columns, ip_NetToMediaTable_get_cell_value, ip_NetToMediaTable_get_next_cell_instance_and_value);
00648 #endif /* LWIP_ARP && LWIP_IPV4 */
00649 
00650 #if LWIP_IPV4
00651 /* the following nodes access variables in LWIP stack from SNMP worker thread and must therefore be synced to LWIP (TCPIP) thread */
00652 CREATE_LWIP_SYNC_NODE( 1, ip_Forwarding)
00653 CREATE_LWIP_SYNC_NODE( 2, ip_DefaultTTL)
00654 CREATE_LWIP_SYNC_NODE( 3, ip_InReceives)
00655 CREATE_LWIP_SYNC_NODE( 4, ip_InHdrErrors)
00656 CREATE_LWIP_SYNC_NODE( 5, ip_InAddrErrors)
00657 CREATE_LWIP_SYNC_NODE( 6, ip_ForwDatagrams)
00658 CREATE_LWIP_SYNC_NODE( 7, ip_InUnknownProtos)
00659 CREATE_LWIP_SYNC_NODE( 8, ip_InDiscards)
00660 CREATE_LWIP_SYNC_NODE( 9, ip_InDelivers)
00661 CREATE_LWIP_SYNC_NODE(10, ip_OutRequests)
00662 CREATE_LWIP_SYNC_NODE(11, ip_OutDiscards)
00663 CREATE_LWIP_SYNC_NODE(12, ip_OutNoRoutes)
00664 CREATE_LWIP_SYNC_NODE(13, ip_ReasmTimeout)
00665 CREATE_LWIP_SYNC_NODE(14, ip_ReasmReqds)
00666 CREATE_LWIP_SYNC_NODE(15, ip_ReasmOKs)
00667 CREATE_LWIP_SYNC_NODE(15, ip_ReasmFails)
00668 CREATE_LWIP_SYNC_NODE(17, ip_FragOKs)
00669 CREATE_LWIP_SYNC_NODE(18, ip_FragFails)
00670 CREATE_LWIP_SYNC_NODE(19, ip_FragCreates)
00671 CREATE_LWIP_SYNC_NODE(20, ip_AddrTable)
00672 CREATE_LWIP_SYNC_NODE(21, ip_RouteTable)
00673 #if LWIP_ARP
00674 CREATE_LWIP_SYNC_NODE(22, ip_NetToMediaTable)
00675 #endif /* LWIP_ARP */
00676 CREATE_LWIP_SYNC_NODE(23, ip_RoutingDiscards)
00677 
00678 static const struct snmp_node *const ip_nodes[] = {
00679   &SYNC_NODE_NAME(ip_Forwarding).node.node,
00680   &SYNC_NODE_NAME(ip_DefaultTTL).node.node,
00681   &SYNC_NODE_NAME(ip_InReceives).node.node,
00682   &SYNC_NODE_NAME(ip_InHdrErrors).node.node,
00683   &SYNC_NODE_NAME(ip_InAddrErrors).node.node,
00684   &SYNC_NODE_NAME(ip_ForwDatagrams).node.node,
00685   &SYNC_NODE_NAME(ip_InUnknownProtos).node.node,
00686   &SYNC_NODE_NAME(ip_InDiscards).node.node,
00687   &SYNC_NODE_NAME(ip_InDelivers).node.node,
00688   &SYNC_NODE_NAME(ip_OutRequests).node.node,
00689   &SYNC_NODE_NAME(ip_OutDiscards).node.node,
00690   &SYNC_NODE_NAME(ip_OutNoRoutes).node.node,
00691   &SYNC_NODE_NAME(ip_ReasmTimeout).node.node,
00692   &SYNC_NODE_NAME(ip_ReasmReqds).node.node,
00693   &SYNC_NODE_NAME(ip_ReasmOKs).node.node,
00694   &SYNC_NODE_NAME(ip_ReasmFails).node.node,
00695   &SYNC_NODE_NAME(ip_FragOKs).node.node,
00696   &SYNC_NODE_NAME(ip_FragFails).node.node,
00697   &SYNC_NODE_NAME(ip_FragCreates).node.node,
00698   &SYNC_NODE_NAME(ip_AddrTable).node.node,
00699   &SYNC_NODE_NAME(ip_RouteTable).node.node,
00700 #if LWIP_ARP
00701   &SYNC_NODE_NAME(ip_NetToMediaTable).node.node,
00702 #endif /* LWIP_ARP */
00703   &SYNC_NODE_NAME(ip_RoutingDiscards).node.node
00704 };
00705 
00706 const struct snmp_tree_node snmp_mib2_ip_root = SNMP_CREATE_TREE_NODE(4, ip_nodes);
00707 #endif /* LWIP_IPV4 */
00708 
00709 /* --- at .1.3.6.1.2.1.3 ----------------------------------------------------- */
00710 
00711 #if LWIP_ARP && LWIP_IPV4
00712 /* at node table is a subset of ip_nettomedia table (same rows but less columns) */
00713 static const struct snmp_table_simple_col_def at_Table_columns[] = {
00714   { 1, SNMP_ASN1_TYPE_INTEGER,      SNMP_VARIANT_VALUE_TYPE_U32 }, /* atIfIndex */
00715   { 2, SNMP_ASN1_TYPE_OCTET_STRING, SNMP_VARIANT_VALUE_TYPE_PTR }, /* atPhysAddress */
00716   { 3, SNMP_ASN1_TYPE_IPADDR,       SNMP_VARIANT_VALUE_TYPE_U32 }  /* atNetAddress */
00717 };
00718 
00719 static const struct snmp_table_simple_node at_Table = SNMP_TABLE_CREATE_SIMPLE(1, at_Table_columns, ip_NetToMediaTable_get_cell_value, ip_NetToMediaTable_get_next_cell_instance_and_value);
00720 
00721 /* the following nodes access variables in LWIP stack from SNMP worker thread and must therefore be synced to LWIP (TCPIP) thread */
00722 CREATE_LWIP_SYNC_NODE(1, at_Table)
00723 
00724 static const struct snmp_node *const at_nodes[] = {
00725   &SYNC_NODE_NAME(at_Table).node.node
00726 };
00727 
00728 const struct snmp_tree_node snmp_mib2_at_root = SNMP_CREATE_TREE_NODE(3, at_nodes);
00729 #endif /* LWIP_ARP && LWIP_IPV4 */
00730 
00731 #endif /* LWIP_SNMP && SNMP_LWIP_MIB2 */