root / slirp / arp_table.c @ 0ef654e3
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1 | 1a0ca1e1 | Fabien Chouteau | /*
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2 | 1a0ca1e1 | Fabien Chouteau | * ARP table
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3 | 1a0ca1e1 | Fabien Chouteau | *
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4 | 1a0ca1e1 | Fabien Chouteau | * Copyright (c) 2011 AdaCore
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5 | 1a0ca1e1 | Fabien Chouteau | *
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6 | 1a0ca1e1 | Fabien Chouteau | * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 | 1a0ca1e1 | Fabien Chouteau | * of this software and associated documentation files (the "Software"), to deal
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8 | 1a0ca1e1 | Fabien Chouteau | * in the Software without restriction, including without limitation the rights
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9 | 1a0ca1e1 | Fabien Chouteau | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 | 1a0ca1e1 | Fabien Chouteau | * copies of the Software, and to permit persons to whom the Software is
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11 | 1a0ca1e1 | Fabien Chouteau | * furnished to do so, subject to the following conditions:
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12 | 1a0ca1e1 | Fabien Chouteau | *
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13 | 1a0ca1e1 | Fabien Chouteau | * The above copyright notice and this permission notice shall be included in
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14 | 1a0ca1e1 | Fabien Chouteau | * all copies or substantial portions of the Software.
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15 | 1a0ca1e1 | Fabien Chouteau | *
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16 | 1a0ca1e1 | Fabien Chouteau | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 | 1a0ca1e1 | Fabien Chouteau | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 | 1a0ca1e1 | Fabien Chouteau | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 | 1a0ca1e1 | Fabien Chouteau | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 | 1a0ca1e1 | Fabien Chouteau | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 | 1a0ca1e1 | Fabien Chouteau | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 | 1a0ca1e1 | Fabien Chouteau | * THE SOFTWARE.
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23 | 1a0ca1e1 | Fabien Chouteau | */
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24 | 1a0ca1e1 | Fabien Chouteau | |
25 | 1a0ca1e1 | Fabien Chouteau | #include "slirp.h" |
26 | 1a0ca1e1 | Fabien Chouteau | |
27 | 5a371a2e | Jan Kiszka | void arp_table_add(Slirp *slirp, uint32_t ip_addr, uint8_t ethaddr[ETH_ALEN])
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28 | 1a0ca1e1 | Fabien Chouteau | { |
29 | 5a371a2e | Jan Kiszka | const uint32_t broadcast_addr =
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30 | 1a0ca1e1 | Fabien Chouteau | ~slirp->vnetwork_mask.s_addr | slirp->vnetwork_addr.s_addr; |
31 | 1a0ca1e1 | Fabien Chouteau | ArpTable *arptbl = &slirp->arp_table; |
32 | 1a0ca1e1 | Fabien Chouteau | int i;
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33 | 1a0ca1e1 | Fabien Chouteau | |
34 | 1a0ca1e1 | Fabien Chouteau | DEBUG_CALL("arp_table_add");
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35 | 1a0ca1e1 | Fabien Chouteau | DEBUG_ARG("ip = 0x%x", ip_addr);
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36 | 1a0ca1e1 | Fabien Chouteau | DEBUG_ARGS((dfd, " hw addr = %02x:%02x:%02x:%02x:%02x:%02x\n",
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37 | 1a0ca1e1 | Fabien Chouteau | ethaddr[0], ethaddr[1], ethaddr[2], |
38 | 1a0ca1e1 | Fabien Chouteau | ethaddr[3], ethaddr[4], ethaddr[5])); |
39 | 1a0ca1e1 | Fabien Chouteau | |
40 | 1a0ca1e1 | Fabien Chouteau | /* Check 0.0.0.0/8 invalid source-only addresses */
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41 | 1a0ca1e1 | Fabien Chouteau | assert((ip_addr & htonl(~(0xf << 28))) != 0); |
42 | 1a0ca1e1 | Fabien Chouteau | |
43 | 1a0ca1e1 | Fabien Chouteau | if (ip_addr == 0xffffffff || ip_addr == broadcast_addr) { |
44 | 1a0ca1e1 | Fabien Chouteau | /* Do not register broadcast addresses */
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45 | 1a0ca1e1 | Fabien Chouteau | return;
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46 | 1a0ca1e1 | Fabien Chouteau | } |
47 | 1a0ca1e1 | Fabien Chouteau | |
48 | 1a0ca1e1 | Fabien Chouteau | /* Search for an entry */
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49 | 1a0ca1e1 | Fabien Chouteau | for (i = 0; i < ARP_TABLE_SIZE; i++) { |
50 | 1a0ca1e1 | Fabien Chouteau | if (arptbl->table[i].ar_sip == ip_addr) {
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51 | 1a0ca1e1 | Fabien Chouteau | /* Update the entry */
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52 | 1a0ca1e1 | Fabien Chouteau | memcpy(arptbl->table[i].ar_sha, ethaddr, ETH_ALEN); |
53 | 1a0ca1e1 | Fabien Chouteau | return;
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54 | 1a0ca1e1 | Fabien Chouteau | } |
55 | 1a0ca1e1 | Fabien Chouteau | } |
56 | 1a0ca1e1 | Fabien Chouteau | |
57 | 1a0ca1e1 | Fabien Chouteau | /* No entry found, create a new one */
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58 | 1a0ca1e1 | Fabien Chouteau | arptbl->table[arptbl->next_victim].ar_sip = ip_addr; |
59 | 1a0ca1e1 | Fabien Chouteau | memcpy(arptbl->table[arptbl->next_victim].ar_sha, ethaddr, ETH_ALEN); |
60 | 1a0ca1e1 | Fabien Chouteau | arptbl->next_victim = (arptbl->next_victim + 1) % ARP_TABLE_SIZE;
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61 | 1a0ca1e1 | Fabien Chouteau | } |
62 | 1a0ca1e1 | Fabien Chouteau | |
63 | 5a371a2e | Jan Kiszka | bool arp_table_search(Slirp *slirp, uint32_t ip_addr,
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64 | 1a0ca1e1 | Fabien Chouteau | uint8_t out_ethaddr[ETH_ALEN]) |
65 | 1a0ca1e1 | Fabien Chouteau | { |
66 | 5a371a2e | Jan Kiszka | const uint32_t broadcast_addr =
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67 | 1a0ca1e1 | Fabien Chouteau | ~slirp->vnetwork_mask.s_addr | slirp->vnetwork_addr.s_addr; |
68 | 1a0ca1e1 | Fabien Chouteau | ArpTable *arptbl = &slirp->arp_table; |
69 | 1a0ca1e1 | Fabien Chouteau | int i;
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70 | 1a0ca1e1 | Fabien Chouteau | |
71 | 1a0ca1e1 | Fabien Chouteau | DEBUG_CALL("arp_table_search");
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72 | 5a371a2e | Jan Kiszka | DEBUG_ARG("ip = 0x%x", ip_addr);
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73 | 1a0ca1e1 | Fabien Chouteau | |
74 | 1a0ca1e1 | Fabien Chouteau | /* Check 0.0.0.0/8 invalid source-only addresses */
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75 | 5a371a2e | Jan Kiszka | assert((ip_addr & htonl(~(0xf << 28))) != 0); |
76 | 1a0ca1e1 | Fabien Chouteau | |
77 | 1a0ca1e1 | Fabien Chouteau | /* If broadcast address */
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78 | 5a371a2e | Jan Kiszka | if (ip_addr == 0xffffffff || ip_addr == broadcast_addr) { |
79 | 1a0ca1e1 | Fabien Chouteau | /* return Ethernet broadcast address */
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80 | 1a0ca1e1 | Fabien Chouteau | memset(out_ethaddr, 0xff, ETH_ALEN);
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81 | 1a0ca1e1 | Fabien Chouteau | return 1; |
82 | 1a0ca1e1 | Fabien Chouteau | } |
83 | 1a0ca1e1 | Fabien Chouteau | |
84 | 1a0ca1e1 | Fabien Chouteau | for (i = 0; i < ARP_TABLE_SIZE; i++) { |
85 | 5a371a2e | Jan Kiszka | if (arptbl->table[i].ar_sip == ip_addr) {
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86 | 1a0ca1e1 | Fabien Chouteau | memcpy(out_ethaddr, arptbl->table[i].ar_sha, ETH_ALEN); |
87 | 1a0ca1e1 | Fabien Chouteau | DEBUG_ARGS((dfd, " found hw addr = %02x:%02x:%02x:%02x:%02x:%02x\n",
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88 | 1a0ca1e1 | Fabien Chouteau | out_ethaddr[0], out_ethaddr[1], out_ethaddr[2], |
89 | 1a0ca1e1 | Fabien Chouteau | out_ethaddr[3], out_ethaddr[4], out_ethaddr[5])); |
90 | 1a0ca1e1 | Fabien Chouteau | return 1; |
91 | 1a0ca1e1 | Fabien Chouteau | } |
92 | 1a0ca1e1 | Fabien Chouteau | } |
93 | 1a0ca1e1 | Fabien Chouteau | |
94 | 1a0ca1e1 | Fabien Chouteau | return 0; |
95 | 1a0ca1e1 | Fabien Chouteau | } |