tests: virtio-9p: add version operation test
[qemu.git] / slirp / arp_table.c
1 /*
2 * ARP table
3 *
4 * Copyright (c) 2011 AdaCore
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25 #include "qemu/osdep.h"
26 #include "slirp.h"
27
28 void arp_table_add(Slirp *slirp, uint32_t ip_addr, uint8_t ethaddr[ETH_ALEN])
29 {
30 const uint32_t broadcast_addr =
31 ~slirp->vnetwork_mask.s_addr | slirp->vnetwork_addr.s_addr;
32 ArpTable *arptbl = &slirp->arp_table;
33 int i;
34
35 DEBUG_CALL("arp_table_add");
36 DEBUG_ARG("ip = 0x%x", ip_addr);
37 DEBUG_ARGS((dfd, " hw addr = %02x:%02x:%02x:%02x:%02x:%02x\n",
38 ethaddr[0], ethaddr[1], ethaddr[2],
39 ethaddr[3], ethaddr[4], ethaddr[5]));
40
41 if (ip_addr == 0 || ip_addr == 0xffffffff || ip_addr == broadcast_addr) {
42 /* Do not register broadcast addresses */
43 return;
44 }
45
46 /* Search for an entry */
47 for (i = 0; i < ARP_TABLE_SIZE; i++) {
48 if (arptbl->table[i].ar_sip == ip_addr) {
49 /* Update the entry */
50 memcpy(arptbl->table[i].ar_sha, ethaddr, ETH_ALEN);
51 return;
52 }
53 }
54
55 /* No entry found, create a new one */
56 arptbl->table[arptbl->next_victim].ar_sip = ip_addr;
57 memcpy(arptbl->table[arptbl->next_victim].ar_sha, ethaddr, ETH_ALEN);
58 arptbl->next_victim = (arptbl->next_victim + 1) % ARP_TABLE_SIZE;
59 }
60
61 bool arp_table_search(Slirp *slirp, uint32_t ip_addr,
62 uint8_t out_ethaddr[ETH_ALEN])
63 {
64 const uint32_t broadcast_addr =
65 ~slirp->vnetwork_mask.s_addr | slirp->vnetwork_addr.s_addr;
66 ArpTable *arptbl = &slirp->arp_table;
67 int i;
68
69 DEBUG_CALL("arp_table_search");
70 DEBUG_ARG("ip = 0x%x", ip_addr);
71
72 /* If broadcast address */
73 if (ip_addr == 0xffffffff || ip_addr == broadcast_addr) {
74 /* return Ethernet broadcast address */
75 memset(out_ethaddr, 0xff, ETH_ALEN);
76 return 1;
77 }
78
79 for (i = 0; i < ARP_TABLE_SIZE; i++) {
80 if (arptbl->table[i].ar_sip == ip_addr) {
81 memcpy(out_ethaddr, arptbl->table[i].ar_sha, ETH_ALEN);
82 DEBUG_ARGS((dfd, " found hw addr = %02x:%02x:%02x:%02x:%02x:%02x\n",
83 out_ethaddr[0], out_ethaddr[1], out_ethaddr[2],
84 out_ethaddr[3], out_ethaddr[4], out_ethaddr[5]));
85 return 1;
86 }
87 }
88
89 return 0;
90 }