-
Notifications
You must be signed in to change notification settings - Fork 1
/
ip_arp.c
72 lines (58 loc) · 2.19 KB
/
ip_arp.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
#include "ip_internal.h"
#include "ip_hw.h"
#include <string.h>
#include <stdio.h>
#define ARP_CACHE_SIZE (8)
ip_return_t ip_handle_arp() {
struct arp_message msg;
ip_rx_read(&msg, ETH_HEADER_SIZE, ARP_MESSAGE_SIZE);
// czy zgadzają się typy protokołów?
if(ip_read16(msg.htype) != ARP_HTYPE_ETHERNET)
return RETURN_FINISHED;
if(ip_read16(msg.ptype) != ARP_PTYPE_IP)
return RETURN_FINISHED;
if(msg.hlen != IP_MAC_SIZE || msg.plen != IP_ADDR_SIZE)
return RETURN_FINISHED;
// TODO: dodaj msg.spa, msg.sha do tablicy ARP
printf("arp ip .%d = mac :%02x\n", msg.spa[3], msg.sha[5]);
// czy to do mnie?
if(memcmp(msg.tpa, ip_config.address, IP_ADDR_SIZE) != 0)
return RETURN_FINISHED;
if(ip_read16(msg.oper) != ARP_OPER_REQUEST)
return RETURN_FINISHED;
printf("arp tx?\n");
// TODO: zacznij wysylanie
ip_return_t r = ip_tx_begin(msg.sha, ETH_PROTO_ARP);
if(r != RETURN_FINISHED)
return r;
// ustaw docelowe na źródłowe adresy
memcpy(msg.tpa, msg.spa, IP_ADDR_SIZE);
memcpy(msg.tha, msg.sha, IP_MAC_SIZE);
// wpisz swoje dane w źródłowych adresach
memcpy(msg.spa, ip_config.address, IP_ADDR_SIZE);
memcpy(msg.sha, ip_config.mac, IP_MAC_SIZE);
// ustaw kod operacji na odpowiedź
ip_write16(msg.oper, ARP_OPER_RESPONSE);
ip_tx_write(&msg, ETH_HEADER_SIZE, sizeof(msg));
printf("arp tx!\n");
return ip_tx_end(sizeof(msg) + ETH_HEADER_SIZE);
}
ip_return_t ip_query_arp(const uint8_t *ip_addr) {
// zacznij wysylanie
ip_return_t r = ip_tx_begin(ip_mac_broadcast, ETH_PROTO_ARP);
if(r != RETURN_FINISHED)
return r;
struct arp_message msg;
ip_write16(msg.htype, ARP_HTYPE_ETHERNET);
ip_write16(msg.ptype, ARP_PTYPE_IP);
msg.hlen = IP_MAC_SIZE;
msg.plen = IP_ADDR_SIZE;
memcpy(msg.sha, ip_config.mac, IP_MAC_SIZE);
memcpy(msg.spa, ip_config.address, IP_ADDR_SIZE);
memset(msg.tha, 0, IP_MAC_SIZE);
memcpy(msg.tpa, ip_addr, IP_MAC_SIZE);
ip_write16(msg.oper, ARP_OPER_REQUEST);
ip_tx_write(&msg, ETH_HEADER_SIZE, sizeof(msg));
printf("arp tx req!\n");
return ip_tx_end(sizeof(msg) + ETH_HEADER_SIZE);
}