| /* |
| * Copyright (c) 2001-2003 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" |
| |
| |
| |
| static u16_t |
| lwip_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; |
| } |
| |
| /* 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 ~(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 ~(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 ~(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 (isascii(c) && isdigit(c)) { |
| val = (val * base) + (c - '0'); |
| c = *++cp; |
| } else if (base == 16 && isascii(c) && isxdigit(c)) { |
| val = (val << 4) | |
| (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! |
| */ |
| u8_t *inet_ntoa(u32_t addr) |
| { |
| static u8_t str[16]; |
| u8_t inv[3]; |
| u8_t *rp; |
| u8_t *ap; |
| u8_t rem; |
| u8_t n; |
| u8_t i; |
| |
| rp = str; |
| ap = (u8_t *)&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 */ |