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git.ipfire.org Git - thirdparty/qemu.git/blob - slirp/src/ndp_table.c
1 /* SPDX-License-Identifier: BSD-3-Clause */
4 * Guillaume Subiron, Yann Bordenave, Serigne Modou Wagne.
9 void ndp_table_add(Slirp
*slirp
, struct in6_addr ip_addr
,
10 uint8_t ethaddr
[ETH_ALEN
])
12 char addrstr
[INET6_ADDRSTRLEN
];
13 NdpTable
*ndp_table
= &slirp
->ndp_table
;
16 inet_ntop(AF_INET6
, &(ip_addr
), addrstr
, INET6_ADDRSTRLEN
);
18 DEBUG_CALL("ndp_table_add");
19 DEBUG_ARG("ip = %s", addrstr
);
20 DEBUG_ARG("hw addr = %02x:%02x:%02x:%02x:%02x:%02x",
21 ethaddr
[0], ethaddr
[1], ethaddr
[2],
22 ethaddr
[3], ethaddr
[4], ethaddr
[5]);
24 if (IN6_IS_ADDR_MULTICAST(&ip_addr
) || in6_zero(&ip_addr
)) {
25 /* Do not register multicast or unspecified addresses */
26 DEBUG_CALL(" abort: do not register multicast or unspecified address");
30 /* Search for an entry */
31 for (i
= 0; i
< NDP_TABLE_SIZE
; i
++) {
32 if (in6_equal(&ndp_table
->table
[i
].ip_addr
, &ip_addr
)) {
33 DEBUG_CALL(" already in table: update the entry");
34 /* Update the entry */
35 memcpy(ndp_table
->table
[i
].eth_addr
, ethaddr
, ETH_ALEN
);
40 /* No entry found, create a new one */
41 DEBUG_CALL(" create new entry");
42 ndp_table
->table
[ndp_table
->next_victim
].ip_addr
= ip_addr
;
43 memcpy(ndp_table
->table
[ndp_table
->next_victim
].eth_addr
,
45 ndp_table
->next_victim
= (ndp_table
->next_victim
+ 1) % NDP_TABLE_SIZE
;
48 bool ndp_table_search(Slirp
*slirp
, struct in6_addr ip_addr
,
49 uint8_t out_ethaddr
[ETH_ALEN
])
51 char addrstr
[INET6_ADDRSTRLEN
];
52 NdpTable
*ndp_table
= &slirp
->ndp_table
;
55 inet_ntop(AF_INET6
, &(ip_addr
), addrstr
, INET6_ADDRSTRLEN
);
57 DEBUG_CALL("ndp_table_search");
58 DEBUG_ARG("ip = %s", addrstr
);
60 assert(!in6_zero(&ip_addr
));
62 /* Multicast address: fec0::abcd:efgh/8 -> 33:33:ab:cd:ef:gh */
63 if (IN6_IS_ADDR_MULTICAST(&ip_addr
)) {
64 out_ethaddr
[0] = 0x33; 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]);
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]);
85 DEBUG_CALL(" ip not found in table");