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/*

 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without modification,

 * are permitted provided that the following conditions are met:

 *

 * 1. Redistributions of source code must retain the above copyright notice,

 *    this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright notice,

 *    this list of conditions and the following disclaimer in the documentation

 *    and/or other materials provided with the distribution.

 * 3. The name of the author may not be used to endorse or promote products

 *    derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED

 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT

 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT

 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING

 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY

 * OF SUCH DAMAGE.

 *

 * This file is part of the lwIP TCP/IP stack.

 *

 * Author: Adam Dunkels <adam@sics.se>

 *

 */

/* inet.c

 *

 * Functions common to all TCP/IP modules, such as the Internet checksum and the

 * byte order functions.

 *

 */

#include "lwip/opt.h"

#include "lwip/arch.h"

#include "lwip/def.h"

#include "lwip/inet.h"

#include "lwip/sys.h"

/* This is a reference implementation of the checksum algorithm

 - it may not work on all architectures, and all processors, particularly

   if they have issues with alignment and 16 bit access.

 - in this case you will need to port it to your architecture and

   #define LWIP_CHKSUM <your_checksum_routine>

   in your sys_arch.h

*/

#ifndef LWIP_CHKSUM

#define LWIP_CHKSUM lwip_standard_chksum

static u16_t

lwip_standard_chksum(void *dataptr, int len)

{

  u32_t acc;

  LWIP_DEBUGF(INET_DEBUG, ("lwip_chksum(%p, %d)\n", (void *)dataptr, len));

  for(acc = 0; len > 1; len -= 2) {

      /*    acc = acc + *((u16_t *)dataptr)++;*/

    acc += *(u16_t *)dataptr;

    dataptr = (void *)((u16_t *)dataptr + 1);

  }

  /* add up any odd byte */

  if (len == 1) {

    acc += htons((u16_t)((*(u8_t *)dataptr) & 0xff) << 8);

    LWIP_DEBUGF(INET_DEBUG, ("inet: chksum: odd byte %d\n", (unsigned int)(*(u8_t *)dataptr)));

  } else {

    LWIP_DEBUGF(INET_DEBUG, ("inet: chksum: no odd byte\n"));

  }

  acc = (acc >> 16) + (acc & 0xffffUL);

  if ((acc & 0xffff0000) != 0) {

    acc = (acc >> 16) + (acc & 0xffffUL);

  }

  return (u16_t)acc;

}

#endif

/* inet_chksum_pseudo:

 *

 * Calculates the pseudo Internet checksum used by TCP and UDP for a pbuf chain.

 */

u16_t

inet_chksum_pseudo(struct pbuf *p,

       struct ip_addr *src, struct ip_addr *dest,

       u8_t proto, u16_t proto_len)

{

  u32_t acc;

  struct pbuf *q;

  u8_t swapped;

  acc = 0;

  swapped = 0;

  /* iterate through all pbuf in chain */

  for(q = p; q != NULL; q = q->next) {

    LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): checksumming pbuf %p (has next %p) \n",

      (void *)q, (void *)q->next));

    acc += LWIP_CHKSUM(q->payload, q->len);

    /*LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): unwrapped lwip_chksum()=%lx \n", acc));*/

    while (acc >> 16) {

      acc = (acc & 0xffffUL) + (acc >> 16);

    }

    if (q->len % 2 != 0) {

      swapped = 1 - swapped;

      acc = ((acc & 0xff) << 8) | ((acc & 0xff00UL) >> 8);

    }

    /*LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): wrapped lwip_chksum()=%lx \n", acc));*/

  }

  if (swapped) {

    acc = ((acc & 0xff) << 8) | ((acc & 0xff00UL) >> 8);

  }

  acc += (src->addr & 0xffffUL);

  acc += ((src->addr >> 16) & 0xffffUL);

  acc += (dest->addr & 0xffffUL);

  acc += ((dest->addr >> 16) & 0xffffUL);

  acc += (u32_t)htons((u16_t)proto);

  acc += (u32_t)htons(proto_len);

  while (acc >> 16) {

    acc = (acc & 0xffffUL) + (acc >> 16);

  }

  LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): pbuf chain lwip_chksum()=%lx\n", acc));

  return (u16_t)~(acc & 0xffffUL);

}

/* inet_chksum:

 *

 * Calculates the Internet checksum over a portion of memory. Used primarely for IP

 * and ICMP.

 */

u16_t

inet_chksum(void *dataptr, u16_t len)

{

  u32_t acc;

  acc = LWIP_CHKSUM(dataptr, len);

  while (acc >> 16) {

    acc = (acc & 0xffff) + (acc >> 16);

  }

  return (u16_t)~(acc & 0xffff);

}

u16_t

inet_chksum_pbuf(struct pbuf *p)

{

  u32_t acc;

  struct pbuf *q;

  u8_t swapped;

  acc = 0;

  swapped = 0;

  for(q = p; q != NULL; q = q->next) {

    acc += LWIP_CHKSUM(q->payload, q->len);

    while (acc >> 16) {

      acc = (acc & 0xffffUL) + (acc >> 16);

    }

    if (q->len % 2 != 0) {

      swapped = 1 - swapped;

      acc = (acc & 0x00ffUL << 8) | (acc & 0xff00UL >> 8);

    }

  }

  if (swapped) {

    acc = ((acc & 0x00ffUL) << 8) | ((acc & 0xff00UL) >> 8);

  }

  return (u16_t)~(acc & 0xffffUL);

}

/* Here for now until needed in other places in lwIP */

#ifndef isascii

#define in_range(c, lo, up)  ((u8_t)c >= lo && (u8_t)c <= up)

#define isascii(c)           in_range(c, 0x20, 0x7f)

#define isdigit(c)           in_range(c, '0', '9')

#define isxdigit(c)          (isdigit(c) || in_range(c, 'a', 'f') || in_range(c, 'A', 'F'))

#define islower(c)           in_range(c, 'a', 'z')

#define isspace(c)           (c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v')

#endif          

 /*

  * Ascii internet address interpretation routine.

  * The value returned is in network order.

  */

 /*  */

 /* inet_addr */

 u32_t inet_addr(const char *cp)

 {

     struct in_addr val;

     if (inet_aton(cp, &val)) {

         return (val.s_addr);

     }

     return (INADDR_NONE);

 }

 /*

  * Check whether "cp" is a valid ascii representation

  * of an Internet address and convert to a binary address.

  * Returns 1 if the address is valid, 0 if not.

  * This replaces inet_addr, the return value from which

  * cannot distinguish between failure and a local broadcast address.

  */

 /*  */

 /* inet_aton */

 int inet_aton(const char *cp, struct in_addr *addr)

 {

     u32_t val;

     int base, n;

     char c;

     u32_t parts[4];

     u32_t* pp = parts;

     c = *cp;

     for (;;) {

         /*

          * Collect number up to ``.''.

          * Values are specified as for C:

          * 0x=hex, 0=octal, isdigit=decimal.

          */

         if (!isdigit(c))

             return (0);

         val = 0; base = 10;

         if (c == '0') {

             c = *++cp;

             if (c == 'x' || c == 'X')

                 base = 16, c = *++cp;

             else

                 base = 8;

         }

         for (;;) {

             if (isdigit(c)) {

                 val = (val * base) + (int)(c - '0');

                 c = *++cp;

             } else if (base == 16 && isxdigit(c)) {

                 val = (val << 4) |

                     (int)(c + 10 - (islower(c) ? 'a' : 'A'));

                 c = *++cp;

             } else

             break;

         }

         if (c == '.') {

             /*

              * Internet format:

              *  a.b.c.d

              *  a.b.c   (with c treated as 16 bits)

              *  a.b (with b treated as 24 bits)

              */

             if (pp >= parts + 3)

                 return (0);

             *pp++ = val;

             c = *++cp;

         } else

             break;

     }

     /*

      * Check for trailing characters.

      */

     if (c != '\0' && (!isascii(c) || !isspace(c)))

         return (0);

     /*

      * Concoct the address according to

      * the number of parts specified.

      */

     n = pp - parts + 1;

     switch (n) {

     case 0:

         return (0);     /* initial nondigit */

     case 1:             /* a -- 32 bits */

         break;

     case 2:             /* a.b -- 8.24 bits */

         if (val > 0xffffff)

             return (0);

         val |= parts[0] << 24;

         break;

     case 3:             /* a.b.c -- 8.8.16 bits */

         if (val > 0xffff)

             return (0);

         val |= (parts[0] << 24) | (parts[1] << 16);

         break;

     case 4:             /* a.b.c.d -- 8.8.8.8 bits */

         if (val > 0xff)

             return (0);

         val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);

         break;

     }

     if (addr)

         addr->s_addr = htonl(val);

     return (1);

 }

/* Convert numeric IP address into decimal dotted ASCII representation.

 * returns ptr to static buffer; not reentrant!

 */

char *inet_ntoa(struct in_addr addr)

{

  static char str[16];

  u32_t s_addr = addr.s_addr;

  char inv[3];

  char *rp;

  u8_t *ap;

  u8_t rem;

  u8_t n;

  u8_t i;

  rp = str;

  ap = (u8_t *)&s_addr;

  for(n = 0; n < 4; n++) {

    i = 0;

    do {

      rem = *ap % (u8_t)10;

      *ap /= (u8_t)10;

      inv[i++] = '0' + rem;

    } while(*ap);

    while(i--)

      *rp++ = inv[i];

    *rp++ = '.';

    ap++;

  }

  *--rp = 0;

  return str;

}

#ifndef BYTE_ORDER

#error BYTE_ORDER is not defined

#endif

#if BYTE_ORDER == LITTLE_ENDIAN

u16_t

htons(u16_t n)

{

  return ((n & 0xff) << 8) | ((n & 0xff00) >> 8);

}

u16_t

ntohs(u16_t n)

{

  return htons(n);

}

u32_t

htonl(u32_t n)

{

  return ((n & 0xff) << 24) |

    ((n & 0xff00) << 8) |

    ((n & 0xff0000) >> 8) |

    ((n & 0xff000000) >> 24);

}

u32_t

ntohl(u32_t n)

{

  return htonl(n);

}

#endif /* BYTE_ORDER == LITTLE_ENDIAN */