Added NE2000 network support.

NE2000 emulation originally from Bochs, ported by SA1988.
SLiRP originally from QEMU, ported by neozeed.

src/slirp/tftp.h

@@ -0,0 +1,40 @@
+/* tftp defines */
+
+#define TFTP_SESSIONS_MAX 3
+
+#define TFTP_SERVER	69
+
+#define TFTP_RRQ    1
+#define TFTP_WRQ    2
+#define TFTP_DATA   3
+#define TFTP_ACK    4
+#define TFTP_ERROR  5
+
+#define TFTP_FILENAME_MAX 512
+
+#ifdef PRAGMA_PACK_SUPPORTED
+#pragma pack(1)
+#endif
+
+struct tftp_t {
+  struct ip ip;
+  struct udphdr udp;
+  u_int16_t tp_op;
+  union {
+    struct { 
+      u_int16_t tp_block_nr;
+      u_int8_t tp_buf[512];
+    } tp_data;
+    struct { 
+      u_int16_t tp_error_code;
+      u_int8_t tp_msg[512];
+    } tp_error;
+    u_int8_t tp_buf[512 + 2];
+  } x;
+} PACKED__;
+
+#ifdef PRAGMA_PACK_SUPPORTED
+#pragma pack(PACK_END)
+#endif
+
+void tftp_input(struct SLIRPmbuf *m);