/[lwip]/lwip/src/core/inet.c
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revision 1.13 by kieranm, Tue Jun 10 10:45:29 2003 UTC revision 1.14 by likewise, Wed Jun 11 22:34:51 2003 UTC
# Line 1  Line 1 
1  /*  /*
2   * Copyright (c) 2001-2003 Swedish Institute of Computer Science.   * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
3   * All rights reserved.   * All rights reserved.
4   *   *
5   * Redistribution and use in source and binary forms, with or without modification,   * Redistribution and use in source and binary forms, with or without modification,
6   * are permitted provided that the following conditions are met:   * are permitted provided that the following conditions are met:
7   *   *
8   * 1. Redistributions of source code must retain the above copyright notice,   * 1. Redistributions of source code must retain the above copyright notice,
# Line 11  Line 11 
11   *    this list of conditions and the following disclaimer in the documentation   *    this list of conditions and the following disclaimer in the documentation
12   *    and/or other materials provided with the distribution.   *    and/or other materials provided with the distribution.
13   * 3. The name of the author may not be used to endorse or promote products   * 3. The name of the author may not be used to endorse or promote products
14   *    derived from this software without specific prior written permission.   *    derived from this software without specific prior written permission.
15   *   *
16   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18   * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT   * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
19   * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,   * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
21   * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS   * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
24   * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY   * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
25   * OF SUCH DAMAGE.   * OF SUCH DAMAGE.
26   *   *
27   * This file is part of the lwIP TCP/IP stack.   * This file is part of the lwIP TCP/IP stack.
28   *   *
29   * Author: Adam Dunkels <adam@sics.se>   * Author: Adam Dunkels <adam@sics.se>
30   *   *
31   */   */
# Line 52  static u16_t Line 52  static u16_t
52  lwip_chksum(void *dataptr, int len)  lwip_chksum(void *dataptr, int len)
53  {  {
54    u32_t acc;    u32_t acc;
55        
56    LWIP_DEBUGF(INET_DEBUG, ("lwip_chksum(%p, %d)\n", dataptr, len));    LWIP_DEBUGF(INET_DEBUG, ("lwip_chksum(%p, %d)\n", (void *)dataptr, len));
57    for(acc = 0; len > 1; len -= 2) {    for(acc = 0; len > 1; len -= 2) {
58        /*    acc = acc + *((u16_t *)dataptr)++;*/        /*    acc = acc + *((u16_t *)dataptr)++;*/
59      acc += *(u16_t *)dataptr;      acc += *(u16_t *)dataptr;
# Line 63  lwip_chksum(void *dataptr, int len) Line 63  lwip_chksum(void *dataptr, int len)
63    /* add up any odd byte */    /* add up any odd byte */
64    if (len == 1) {    if (len == 1) {
65      acc += htons((u16_t)((*(u8_t *)dataptr) & 0xff) << 8);      acc += htons((u16_t)((*(u8_t *)dataptr) & 0xff) << 8);
66      LWIP_DEBUGF(INET_DEBUG, ("inet: chksum: odd byte %d\n", *(u8_t *)dataptr));      LWIP_DEBUGF(INET_DEBUG, ("inet: chksum: odd byte %d\n", (unsigned int)(*(u8_t *)dataptr)));
67    } else {    } else {
68      LWIP_DEBUGF(INET_DEBUG, ("inet: chksum: no odd byte\n"));      LWIP_DEBUGF(INET_DEBUG, ("inet: chksum: no odd byte\n"));
69    }    }
# Line 93  inet_chksum_pseudo(struct pbuf *p, Line 93  inet_chksum_pseudo(struct pbuf *p,
93    acc = 0;    acc = 0;
94    swapped = 0;    swapped = 0;
95    /* iterate through all pbuf in chain */    /* iterate through all pbuf in chain */
96    for(q = p; q != NULL; q = q->next) {        for(q = p; q != NULL; q = q->next) {
97      LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): checksumming pbuf %p (has next %p) \n", (void *) q, (void *)q->next));      LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): checksumming pbuf %p (has next %p) \n",
98          (void *)q, (void *)q->next));
99      acc += lwip_chksum(q->payload, q->len);      acc += lwip_chksum(q->payload, q->len);
100      /*LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): unwrapped lwip_chksum()=%lx \n", acc));*/      /*LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): unwrapped lwip_chksum()=%lx \n", acc));*/
101      while (acc >> 16) {      while (acc >> 16) {
# Line 115  inet_chksum_pseudo(struct pbuf *p, Line 116  inet_chksum_pseudo(struct pbuf *p,
116    acc += (dest->addr & 0xffffUL);    acc += (dest->addr & 0xffffUL);
117    acc += ((dest->addr >> 16) & 0xffffUL);    acc += ((dest->addr >> 16) & 0xffffUL);
118    acc += (u32_t)htons((u16_t)proto);    acc += (u32_t)htons((u16_t)proto);
119    acc += (u32_t)htons(proto_len);      acc += (u32_t)htons(proto_len);
120      
121    while (acc >> 16) {    while (acc >> 16) {
122      acc = (acc & 0xffffUL) + (acc >> 16);      acc = (acc & 0xffffUL) + (acc >> 16);
123    }        }
124    LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): pbuf chain lwip_chksum()=%lx\n", acc));    LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): pbuf chain lwip_chksum()=%lx\n", acc));
125    return ~(acc & 0xffffUL);    return ~(acc & 0xffffUL);
126  }  }
# Line 138  inet_chksum(void *dataptr, u16_t len) Line 139  inet_chksum(void *dataptr, u16_t len)
139    acc = lwip_chksum(dataptr, len);    acc = lwip_chksum(dataptr, len);
140    while (acc >> 16) {    while (acc >> 16) {
141      acc = (acc & 0xffff) + (acc >> 16);      acc = (acc & 0xffff) + (acc >> 16);
142    }        }
143    return ~(acc & 0xffff);    return ~(acc & 0xffff);
144  }  }
145  /*-----------------------------------------------------------------------------------*/  /*-----------------------------------------------------------------------------------*/
# Line 148  inet_chksum_pbuf(struct pbuf *p) Line 149  inet_chksum_pbuf(struct pbuf *p)
149    u32_t acc;    u32_t acc;
150    struct pbuf *q;    struct pbuf *q;
151    u8_t swapped;    u8_t swapped;
152      
153    acc = 0;    acc = 0;
154    swapped = 0;    swapped = 0;
155    for(q = p; q != NULL; q = q->next) {    for(q = p; q != NULL; q = q->next) {
156      acc += lwip_chksum(q->payload, q->len);      acc += lwip_chksum(q->payload, q->len);
157      while (acc >> 16) {      while (acc >> 16) {
158        acc = (acc & 0xffffUL) + (acc >> 16);        acc = (acc & 0xffffUL) + (acc >> 16);
159      }          }
160      if (q->len % 2 != 0) {      if (q->len % 2 != 0) {
161        swapped = 1 - swapped;        swapped = 1 - swapped;
162        acc = (acc & 0x00ffUL << 8) | (acc & 0xff00UL >> 8);        acc = (acc & 0x00ffUL << 8) | (acc & 0xff00UL >> 8);
163      }      }
164    }    }
165    
166    if (swapped) {    if (swapped) {
167      acc = ((acc & 0x00ffUL) << 8) | ((acc & 0xff00UL) >> 8);      acc = ((acc & 0x00ffUL) << 8) | ((acc & 0xff00UL) >> 8);
168    }    }
# Line 173  inet_chksum_pbuf(struct pbuf *p) Line 174  inet_chksum_pbuf(struct pbuf *p)
174    * Ascii internet address interpretation routine.    * Ascii internet address interpretation routine.
175    * The value returned is in network order.    * The value returned is in network order.
176    */    */
177    
178   /*  */   /*  */
179   /* inet_addr */   /* inet_addr */
180   u32_t inet_addr(const char *cp)   u32_t inet_addr(const char *cp)
181   {   {
182       struct in_addr val;       struct in_addr val;
183    
184       if (inet_aton(cp, &val)) {       if (inet_aton(cp, &val)) {
185           return (val.s_addr);           return (val.s_addr);
186       }       }
187       return (INADDR_NONE);       return (INADDR_NONE);
188   }   }
189    
190   /*   /*
191    * Check whether "cp" is a valid ascii representation    * Check whether "cp" is a valid ascii representation
192    * of an Internet address and convert to a binary address.    * of an Internet address and convert to a binary address.
193    * Returns 1 if the address is valid, 0 if not.    * Returns 1 if the address is valid, 0 if not.
# Line 202  inet_chksum_pbuf(struct pbuf *p) Line 203  inet_chksum_pbuf(struct pbuf *p)
203       char c;       char c;
204       u32_t parts[4];       u32_t parts[4];
205       u32_t* pp = parts;       u32_t* pp = parts;
206    
207       c = *cp;       c = *cp;
208       for (;;) {       for (;;) {
209           /*           /*
# Line 256  inet_chksum_pbuf(struct pbuf *p) Line 257  inet_chksum_pbuf(struct pbuf *p)
257        */        */
258       n = pp - parts + 1;       n = pp - parts + 1;
259       switch (n) {       switch (n) {
260    
261       case 0:       case 0:
262           return (0);     /* initial nondigit */           return (0);     /* initial nondigit */
263    
264       case 1:             /* a -- 32 bits */       case 1:             /* a -- 32 bits */
265           break;           break;
266    
267       case 2:             /* a.b -- 8.24 bits */       case 2:             /* a.b -- 8.24 bits */
268           if (val > 0xffffff)           if (val > 0xffffff)
269               return (0);               return (0);
270           val |= parts[0] << 24;           val |= parts[0] << 24;
271           break;           break;
272    
273       case 3:             /* a.b.c -- 8.8.16 bits */       case 3:             /* a.b.c -- 8.8.16 bits */
274           if (val > 0xffff)           if (val > 0xffff)
275               return (0);               return (0);
276           val |= (parts[0] << 24) | (parts[1] << 16);           val |= (parts[0] << 24) | (parts[1] << 16);
277           break;           break;
278    
279       case 4:             /* a.b.c.d -- 8.8.8.8 bits */       case 4:             /* a.b.c.d -- 8.8.8.8 bits */
280           if (val > 0xff)           if (val > 0xff)
281               return (0);               return (0);

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