1 | /* SPDX-License-Identifier: BSD-3-Clause */ |
2 | /* |
3 | * Copyright (c) 2013 |
4 | * Guillaume Subiron, Yann Bordenave, Serigne Modou Wagne. |
5 | */ |
6 | |
7 | #include "slirp.h" |
8 | |
9 | void ndp_table_add(Slirp *slirp, struct in6_addr ip_addr, |
10 | uint8_t ethaddr[ETH_ALEN]) |
11 | { |
12 | char addrstr[INET6_ADDRSTRLEN]; |
13 | NdpTable *ndp_table = &slirp->ndp_table; |
14 | int i; |
15 | |
16 | inet_ntop(AF_INET6, &(ip_addr), addrstr, INET6_ADDRSTRLEN); |
17 | |
18 | DEBUG_CALL("ndp_table_add" ); |
19 | DEBUG_ARG("ip = %s" , addrstr); |
20 | DEBUG_ARG("hw addr = %02x:%02x:%02x:%02x:%02x:%02x" , ethaddr[0], ethaddr[1], |
21 | ethaddr[2], ethaddr[3], ethaddr[4], ethaddr[5]); |
22 | |
23 | if (IN6_IS_ADDR_MULTICAST(&ip_addr) || in6_zero(&ip_addr)) { |
24 | /* Do not register multicast or unspecified addresses */ |
25 | DEBUG_CALL(" abort: do not register multicast or unspecified address" ); |
26 | return; |
27 | } |
28 | |
29 | /* Search for an entry */ |
30 | for (i = 0; i < NDP_TABLE_SIZE; i++) { |
31 | if (in6_equal(&ndp_table->table[i].ip_addr, &ip_addr)) { |
32 | DEBUG_CALL(" already in table: update the entry" ); |
33 | /* Update the entry */ |
34 | memcpy(ndp_table->table[i].eth_addr, ethaddr, ETH_ALEN); |
35 | return; |
36 | } |
37 | } |
38 | |
39 | /* No entry found, create a new one */ |
40 | DEBUG_CALL(" create new entry" ); |
41 | ndp_table->table[ndp_table->next_victim].ip_addr = ip_addr; |
42 | memcpy(ndp_table->table[ndp_table->next_victim].eth_addr, ethaddr, |
43 | ETH_ALEN); |
44 | ndp_table->next_victim = (ndp_table->next_victim + 1) % NDP_TABLE_SIZE; |
45 | } |
46 | |
47 | bool ndp_table_search(Slirp *slirp, struct in6_addr ip_addr, |
48 | uint8_t out_ethaddr[ETH_ALEN]) |
49 | { |
50 | char addrstr[INET6_ADDRSTRLEN]; |
51 | NdpTable *ndp_table = &slirp->ndp_table; |
52 | int i; |
53 | |
54 | inet_ntop(AF_INET6, &(ip_addr), addrstr, INET6_ADDRSTRLEN); |
55 | |
56 | DEBUG_CALL("ndp_table_search" ); |
57 | DEBUG_ARG("ip = %s" , addrstr); |
58 | |
59 | assert(!in6_zero(&ip_addr)); |
60 | |
61 | /* Multicast address: fec0::abcd:efgh/8 -> 33:33:ab:cd:ef:gh */ |
62 | if (IN6_IS_ADDR_MULTICAST(&ip_addr)) { |
63 | out_ethaddr[0] = 0x33; |
64 | out_ethaddr[1] = 0x33; |
65 | out_ethaddr[2] = ip_addr.s6_addr[12]; |
66 | out_ethaddr[3] = ip_addr.s6_addr[13]; |
67 | out_ethaddr[4] = ip_addr.s6_addr[14]; |
68 | out_ethaddr[5] = ip_addr.s6_addr[15]; |
69 | DEBUG_ARG("multicast addr = %02x:%02x:%02x:%02x:%02x:%02x" , |
70 | out_ethaddr[0], out_ethaddr[1], out_ethaddr[2], |
71 | out_ethaddr[3], out_ethaddr[4], out_ethaddr[5]); |
72 | return 1; |
73 | } |
74 | |
75 | for (i = 0; i < NDP_TABLE_SIZE; i++) { |
76 | if (in6_equal(&ndp_table->table[i].ip_addr, &ip_addr)) { |
77 | memcpy(out_ethaddr, ndp_table->table[i].eth_addr, ETH_ALEN); |
78 | DEBUG_ARG("found hw addr = %02x:%02x:%02x:%02x:%02x:%02x" , |
79 | out_ethaddr[0], out_ethaddr[1], out_ethaddr[2], |
80 | out_ethaddr[3], out_ethaddr[4], out_ethaddr[5]); |
81 | return 1; |
82 | } |
83 | } |
84 | |
85 | DEBUG_CALL(" ip not found in table" ); |
86 | return 0; |
87 | } |
88 | |