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1.1 root 1: //
2: // nono
1.1.1.3 root 3: // Copyright (C) 2020 nono project
4: // Licensed under nono-license.txt
1.1 root 5: //
6:
7: #include "ethernet.h"
1.1.1.3 root 8: #include "config.h"
1.1 root 9: #include "netdriver_bpf.h"
10: #include "netdriver_tap.h"
11: #include "netdriver_none.h"
12: #include <random>
13:
1.1.1.2 root 14: std::unique_ptr<EthernetDevice> gEthernet;
1.1 root 15:
16: // コンストラクタ
17: EthernetDevice::EthernetDevice()
18: {
19: }
20:
21: // デストラクタ
22: EthernetDevice::~EthernetDevice()
23: {
24: }
25:
26: // 動的なコンストラクション
27: bool
28: EthernetDevice::Create()
29: {
1.1.1.3 root 30: const ConfigItem& item = gConfig->Find("ethernet-hostdriver");
1.1.1.2 root 31: const std::string& type = item.AsString();
1.1.1.4 ! root 32:
1.1 root 33: if (type == "none") {
1.1.1.2 root 34: gNetDriver.reset(new NetDriverNone());
1.1 root 35: } else if (type == "tap") {
36: #if defined(NETDRIVER_TAP)
1.1.1.4 ! root 37: const ConfigItem& item_devpath = gConfig->Find("ethernet-hostdevice");
! 38: const std::string& devpath = item_devpath.AsString();
! 39:
1.1 root 40: try {
1.1.1.4 ! root 41: gNetDriver.reset(new NetDriverTap(this, &mtx, &cv, devpath));
1.1 root 42: } catch (...) {
43: warnx("Creating NetDriverTap failed");
44: return false;
45: }
46: #else
1.1.1.2 root 47: item.Err("tap not supported");
1.1 root 48: return false;
49: #endif
50: } else if (type == "bpf") {
51: #if defined(NETDRIVER_BPF)
52: try {
1.1.1.2 root 53: gNetDriver.reset(new NetDriverBPF(this, &mtx, &cv));
1.1 root 54: } catch (...) {
55: warnx("Creating NetDriverBPF failed");
56: return false;
57: }
58: #else
1.1.1.2 root 59: item.Err("bpf not supported");
1.1 root 60: return false;
61: #endif
62: } else {
1.1.1.2 root 63: item.Err();
1.1 root 64: return false;
65: }
1.1.1.2 root 66: assert((bool)gNetDriver);
1.1 root 67:
68: return true;
69: }
70:
71: // 初期化
72: bool
73: EthernetDevice::Init()
74: {
75: if (gNetDriver->Init() == false) {
1.1.1.2 root 76: gNetDriver.reset();
1.1 root 77: return false;
78: }
79:
80: return true;
81: }
82:
83: // MAC アドレスをてきとーに生成する。
84: // 02:00:01 はローカルだし割り当てもされてなさそうなので使っちゃえ。
85: // 下3バイトは乱数。
86: /*static*/ void
87: EthernetDevice::GenerateMacAddr(macaddr_t *addrp)
88: {
89: std::random_device rnd;
90: uint32 x = rnd();
91:
92: macaddr_t& addr = *addrp;
93: addr[0] = 0x02;
94: addr[1] = 0x00;
95: addr[2] = 0x01;
96: addr[3] = (x >> 16) & 0xff;
97: addr[4] = (x >> 8) & 0xff;
98: addr[5] = x & 0xff;
99: }
100:
101: // MAC アドレス文字列をバイナリに変換して返す。
102: // "HH:HH:HH:HH:HH:HH" 形式のみ。
103: // 成功すれば true を返す。
104: /*static*/ bool
105: EthernetDevice::ParseMacAddr(macaddr_t& dst, const std::string& src)
106: {
107: const char *p;
108: char *e;
109:
110: p = src.data();
111: for (int i = 0; ; ) {
112: unsigned long val = strtoul(p, &e, 16);
113:
114: if (p == e) {
115: return false;
116: }
117: if (val > 0xff) {
118: return false;
119: }
120: dst[i++] = val;
121: p = e;
122:
123: // 最後だけ ':' をチェックしないので
124: if (i == 6) {
125: break;
126: }
127:
128: if (*p++ != ':') {
129: return false;
130: }
131: }
132: if (*p != '\0') {
133: return false;
134: }
135: return true;
136: }
137:
138: // パケットを送信する (VM から呼ばれる)
139: bool
140: EthernetDevice::SendPacket(const std::vector<uint8>& buf)
141: {
142: return gNetDriver->SendPacket(buf);
143: }
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