slirp/ndp_table.c

   1 /*
   2  * Copyright (c) 2013
   3  * Guillaume Subiron, Yann Bordenave, Serigne Modou Wagne.
   4  */
   5
   6 #include "qemu/osdep.h"
   7 #include "qemu-common.h"
   8 #include "slirp.h"
   9
  10 void ndp_table_add(Slirp *slirp, struct in6_addr ip_addr,
  11                     uint8_t ethaddr[ETH_ALEN])
  12 {
  13     NdpTable *ndp_table = &slirp->ndp_table;
  14     int i;
  15
  16     DEBUG_CALL("ndp_table_add");
  17 #if !defined(_WIN32) || (_WIN32_WINNT >= 0x0600)
  18     char addrstr[INET6_ADDRSTRLEN];
  19     inet_ntop(AF_INET6, &(ip_addr), addrstr, INET6_ADDRSTRLEN);
  20     DEBUG_ARG("ip = %s", addrstr);
  21 #endif
  22     DEBUG_ARGS((dfd, " hw addr = %02x:%02x:%02x:%02x:%02x:%02x\n",
  23                 ethaddr[0], ethaddr[1], ethaddr[2],
  24                 ethaddr[3], ethaddr[4], ethaddr[5]));
  25
  26     if (IN6_IS_ADDR_MULTICAST(&ip_addr) || IN6_IS_ADDR_UNSPECIFIED(&ip_addr)) {
  27         /* Do not register multicast or unspecified addresses */
  28         DEBUG_CALL(" abort: do not register multicast or unspecified address");
  29         return;
  30     }
  31
  32     /* Search for an entry */
  33     for (i = 0; i < NDP_TABLE_SIZE; i++) {
  34         if (in6_equal(&ndp_table->table[i].ip_addr, &ip_addr)) {
  35             DEBUG_CALL(" already in table: update the entry");
  36             /* Update the entry */
  37             memcpy(ndp_table->table[i].eth_addr, ethaddr, ETH_ALEN);
  38             return;
  39         }
  40     }
  41
  42     /* No entry found, create a new one */
  43     DEBUG_CALL(" create new entry");
  44     ndp_table->table[ndp_table->next_victim].ip_addr = ip_addr;
  45     memcpy(ndp_table->table[ndp_table->next_victim].eth_addr,
  46             ethaddr, ETH_ALEN);
  47     ndp_table->next_victim = (ndp_table->next_victim + 1) % NDP_TABLE_SIZE;
  48 }
  49
  50 bool ndp_table_search(Slirp *slirp, struct in6_addr ip_addr,
  51                       uint8_t out_ethaddr[ETH_ALEN])
  52 {
  53     NdpTable *ndp_table = &slirp->ndp_table;
  54     int i;
  55
  56     DEBUG_CALL("ndp_table_search");
  57 #if !defined(_WIN32) || (_WIN32_WINNT >= 0x0600)
  58     char addrstr[INET6_ADDRSTRLEN];
  59     inet_ntop(AF_INET6, &(ip_addr), addrstr, INET6_ADDRSTRLEN);
  60     DEBUG_ARG("ip = %s", addrstr);
  61 #endif
  62
  63     assert(!IN6_IS_ADDR_UNSPECIFIED(&ip_addr));
  64
  65     /* Multicast address: fec0::abcd:efgh/8 -> 33:33:ab:cd:ef:gh */
  66     if (IN6_IS_ADDR_MULTICAST(&ip_addr)) {
  67         out_ethaddr[0] = 0x33; out_ethaddr[1] = 0x33;
  68         out_ethaddr[2] = ip_addr.s6_addr[12];
  69         out_ethaddr[3] = ip_addr.s6_addr[13];
  70         out_ethaddr[4] = ip_addr.s6_addr[14];
  71         out_ethaddr[5] = ip_addr.s6_addr[15];
  72         DEBUG_ARGS((dfd, " multicast addr = %02x:%02x:%02x:%02x:%02x:%02x\n",
  73                     out_ethaddr[0], out_ethaddr[1], out_ethaddr[2],
  74                     out_ethaddr[3], out_ethaddr[4], out_ethaddr[5]));
  75         return 1;
  76     }
  77
  78     for (i = 0; i < NDP_TABLE_SIZE; i++) {
  79         if (in6_equal(&ndp_table->table[i].ip_addr, &ip_addr)) {
  80             memcpy(out_ethaddr, ndp_table->table[i].eth_addr,  ETH_ALEN);
  81             DEBUG_ARGS((dfd, " found hw addr = %02x:%02x:%02x:%02x:%02x:%02x\n",
  82                         out_ethaddr[0], out_ethaddr[1], out_ethaddr[2],
  83                         out_ethaddr[3], out_ethaddr[4], out_ethaddr[5]));
  84             return 1;
  85         }
  86     }
  87
  88     DEBUG_CALL(" ip not found in table");
  89     return 0;
  90 }