?? uip.lst
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C51 COMPILER V7.06 UIP 04/05/2006 12:13:01 PAGE 1
C51 COMPILER V7.06, COMPILATION OF MODULE UIP
OBJECT MODULE PLACED IN .\DEBUG\uip.obj
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE uip\uip.c LARGE OPTIMIZE(6,SPEED) BROWSE DEBUG OBJECTEXTEND PRINT(.\DEBUG\u
-ip.lst) OBJECT(.\DEBUG\uip.obj)
stmt level source
1
2 /*
3 This is a small implementation of the IP and TCP protocols (as well as
4 some basic ICMP stuff). The implementation couples the IP, TCP and the
5 application layers very tightly. To keep the size of the compiled code
6 down, this code also features heavy usage of the goto statement.
7
8 The principle is that we have a small buffer, called the uip_buf, in which
9 the device driver puts an incoming packet. The TCP/IP stack parses the
10 headers in the packet, and calls upon the application. If the remote
11 host has sent data to the application, this data is present in the uip_buf
12 and the application read the data from there. It is up to the
13 application to put this data into a byte stream if needed. The
14 application will not be fed with data that is out of sequence.
15
16 If the application whishes to send data to the peer, it should put its
17 data into the uip_buf, 40 bytes from the start of the buffer. The TCP/IP
18 stack will calculate the checksums, and fill in the necessary header
19 fields and finally send the packet back to the peer. */
20
21 #include "uip.h"
22 #include "uipopt.h"
23 #include "uip_arch.h"
24
25 #include <LCD\LCD.h>
26 /*-----------------------------------------------------------------------------------*/
27 /* Variable definitions. */
28
29 u8_t uip_buf[UIP_BUFSIZE]; /* The packet buffer that contains
30 incoming packets. */
31 volatile u8_t *uip_appdata; /* The uip_appdata pointer points to
32 application data. */
33
34 #if UIP_BUFSIZE > 255
volatile u16_t uip_len; /* The uip_len is either 8 or 16 bits,
depending on the maximum packet
size. */
#else
39 volatile u8_t uip_len;
40 #endif /* UIP_BUFSIZE > 255 */
41
42 volatile u8_t uip_flags; /* The uip_flags variable is used for
43 communication between the TCP/IP stack
44 and the application program. */
45 struct uip_conn *uip_conn; /* uip_conn always points to the current
46 connection. */
47
48 struct uip_conn uip_conns[UIP_CONNS];
49 /* The uip_conns array holds all TCP
50 connections. */
51 u16_t uip_listenports[UIP_LISTENPORTS];
52 /* The uip_listenports list all currently
53 listning ports. */
54
C51 COMPILER V7.06 UIP 04/05/2006 12:13:01 PAGE 2
55
56 static u16_t ipid; /* Ths ipid variable is an increasing
57 number that is used for the IP ID
58 field. */
59
60 static u8_t iss[4]; /* The iss variable is used for the TCP
61 initial sequence number. */
62
63 #if UIP_ACTIVE_OPEN
static u16_t lastport; /* Keeps track of the last port used for
a new connection. */
#endif /* UIP_ACTIVE_OPEN */
67
68 /* Temporary variables. */
69 static u8_t c, opt;
70 static u16_t tmpport;
71
72 /* Structures and definitions. */
73 typedef struct {
74 /* IP header. */
75 u8_t vhl,
76 tos,
77 len[2],
78 ipid[2],
79 ipoffset[2],
80 ttl,
81 proto;
82 u16_t ipchksum;
83 u16_t srcipaddr[2],
84 destipaddr[2];
85 /* ICMP (echo) header. */
86 u8_t type, icode;
87 u16_t icmpchksum;
88 u16_t id, seqno;
89 } ipicmphdr;
90
91 #define TCP_FIN 0x01
92 #define TCP_SYN 0x02
93 #define TCP_RST 0x04
94 #define TCP_PSH 0x08
95 #define TCP_ACK 0x10
96 #define TCP_URG 0x20
97
98 #define IP_PROTO_ICMP 1
99 #define IP_PROTO_TCP 6
100
101 #define ICMP_ECHO_REPLY 0
102 #define ICMP_ECHO 8
103
104 /* Macros. */
105 #define BUF ((uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
106 #define ICMPBUF ((ipicmphdr *)&uip_buf[UIP_LLH_LEN])
107
108 #if UIP_STATISTICS == 1
109 //struct uip_stats uip_stat; LEON;
110 struct uip_stats uip_stat={
111 {0,0,0,0,0,0,0,0,0},
112 {0,0,0,0},
113 {0,0,0,0,0,0,0,0,0},
114 };
115 #define UIP_STAT(s) s
116 #else
C51 COMPILER V7.06 UIP 04/05/2006 12:13:01 PAGE 3
#define UIP_STAT(s)
#endif /* UIP_STATISTICS == 1 */
119
120 #if UIP_LOGGING == 1
#define UIP_LOG(m) printf("%s\n", m)
#else
123 #define UIP_LOG(m) //LCD_log(m) //leon;
124 #endif /* UIP_LOGGING == 1 */
125
126 /*-----------------------------------------------------------------------------------*/
127 void
128 uip_init(void)
129 {
130 1 for(c = 0; c < UIP_LISTENPORTS; ++c) {
131 2 uip_listenports[c] = 0;
132 2 }
133 1 for(c = 0; c < UIP_CONNS; ++c) {
134 2 uip_conns[c].tcpstateflags = CLOSED;
135 2 }
136 1 #if UIP_ACTIVE_OPEN
lastport = 1024;
#endif /* UIP_ACTIVE_OPEN */
139 1 }
140 /*-----------------------------------------------------------------------------------*/
141 #if UIP_ACTIVE_OPEN
struct uip_conn *
uip_connect(u16_t *ripaddr, u16_t rport)
{
struct uip_conn *conn;
/* Find an unused local port. */
again:
++lastport;
if(lastport >= 32000) {
lastport = 4096;
}
for(c = 0; c < UIP_CONNS; ++c) {
if(uip_conns[c].tcpstateflags != CLOSED &&
uip_conns[c].lport == lastport)
goto again;
}
for(c = 0; c < UIP_CONNS; ++c) {
if(uip_conns[c].tcpstateflags == CLOSED)
goto found_unused;
}
for(c = 0; c < UIP_CONNS; ++c) {
if(uip_conns[c].tcpstateflags == TIME_WAIT)
goto found_unused;
}
return (void *)0;
found_unused:
conn = &uip_conns[c];
conn->tcpstateflags = SYN_SENT | UIP_OUTSTANDING;
conn->snd_nxt[0] = conn->ack_nxt[0] = iss[0];
C51 COMPILER V7.06 UIP 04/05/2006 12:13:01 PAGE 4
conn->snd_nxt[1] = conn->ack_nxt[1] = iss[1];
conn->snd_nxt[2] = conn->ack_nxt[2] = iss[2];
conn->snd_nxt[3] = conn->ack_nxt[3] = iss[3];
if(++conn->ack_nxt[3] == 0) {
if(++conn->ack_nxt[2] == 0) {
if(++conn->ack_nxt[1] == 0) {
++conn->ack_nxt[0];
}
}
}
conn->nrtx = 0;
conn->timer = 1; /* Send the SYN next time around. */
conn->lport = htons(lastport);
conn->rport = htons(rport);
conn->ripaddr[0] = ripaddr[0];
conn->ripaddr[1] = ripaddr[1];
return conn;
}
#endif /* UIP_ACTIVE_OPEN */
201 /*-----------------------------------------------------------------------------------*/
202 void
203 uip_listen(u16_t port)
204 {
205 1 for(c = 0; c < UIP_LISTENPORTS; ++c) {
206 2 if(uip_listenports[c] == 0) {
207 3 uip_listenports[c] = htons(port);
208 3 break;
209 3 }
210 2 }
211 1 }
212 /*-----------------------------------------------------------------------------------*/
213 void
214 uip_process(u8_t flag)
215 {
216 1 uip_appdata = &uip_buf[40 + UIP_LLH_LEN];
217 1
218 1 /* Check if we were invoked because of the perodic timer fireing. */
219 1 if(flag == UIP_TIMER) {
220 2 /* Increase the initial sequence number. */
221 2 if(++iss[3] == 0) {
222 3 if(++iss[2] == 0) {
223 4 if(++iss[1] == 0) {
224 5 ++iss[0];
225 5 }
226 4 }
227 3 }
228 2 uip_len = 0;
229 2 if(uip_conn->tcpstateflags == TIME_WAIT ||
230 2 uip_conn->tcpstateflags == FIN_WAIT_2) {
231 3 ++(uip_conn->timer);
232 3 if(uip_conn->timer == UIP_TIME_WAIT_TIMEOUT) {
233 4 uip_conn->tcpstateflags = CLOSED;
234 4 }
235 3 } else if(uip_conn->tcpstateflags != CLOSED) {
236 3 /* If the connection has outstanding data, we increase the
237 3 connection's timer and see if it has reached the RTO value
238 3 in which case we retransmit. */
239 3 if(uip_conn->tcpstateflags & UIP_OUTSTANDING) {
240 4 --(uip_conn->timer);
C51 COMPILER V7.06 UIP 04/05/2006 12:13:01 PAGE 5
241 4 if(uip_conn->timer == 0) {
242 5
243 5 if(uip_conn->nrtx == UIP_MAXRTX) {
244 6 uip_conn->tcpstateflags = CLOSED;
245 6
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