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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Generic network code. Moved from net.c
- *
- * Copyright 1994 - 2000 Neil Russell.
- * Copyright 2000 Roland Borde
- * Copyright 2000 Paolo Scaffardi
- * Copyright 2000-2002 Wolfgang Denk, wd@denx.de
- * Copyright 2009 Dirk Behme, dirk.behme@googlemail.com
- */
- #include <common.h>
- #include <net.h>
- struct in_addr string_to_ip(const char *s)
- {
- struct in_addr addr;
- char *e;
- int i;
- addr.s_addr = 0;
- if (s == NULL)
- return addr;
- for (addr.s_addr = 0, i = 0; i < 4; ++i) {
- ulong val = s ? simple_strtoul(s, &e, 10) : 0;
- if (val > 255) {
- addr.s_addr = 0;
- return addr;
- }
- if (i != 3 && *e != '.') {
- addr.s_addr = 0;
- return addr;
- }
- addr.s_addr <<= 8;
- addr.s_addr |= (val & 0xFF);
- if (s) {
- s = (*e) ? e+1 : e;
- }
- }
- addr.s_addr = htonl(addr.s_addr);
- return addr;
- }
- void string_to_enetaddr(const char *addr, uint8_t *enetaddr)
- {
- char *end;
- int i;
- if (!enetaddr)
- return;
- for (i = 0; i < 6; ++i) {
- enetaddr[i] = addr ? simple_strtoul(addr, &end, 16) : 0;
- if (addr)
- addr = (*end) ? end + 1 : end;
- }
- }
- uint compute_ip_checksum(const void *vptr, uint nbytes)
- {
- int sum, oddbyte;
- const unsigned short *ptr = vptr;
- sum = 0;
- while (nbytes > 1) {
- sum += *ptr++;
- nbytes -= 2;
- }
- if (nbytes == 1) {
- oddbyte = 0;
- ((u8 *)&oddbyte)[0] = *(u8 *)ptr;
- ((u8 *)&oddbyte)[1] = 0;
- sum += oddbyte;
- }
- sum = (sum >> 16) + (sum & 0xffff);
- sum += (sum >> 16);
- sum = ~sum & 0xffff;
- return sum;
- }
- uint add_ip_checksums(uint offset, uint sum, uint new)
- {
- ulong checksum;
- sum = ~sum & 0xffff;
- new = ~new & 0xffff;
- if (offset & 1) {
- /*
- * byte-swap the sum if it came from an odd offset; since the
- * computation is endian-independent this works.
- */
- new = ((new >> 8) & 0xff) | ((new << 8) & 0xff00);
- }
- checksum = sum + new;
- if (checksum > 0xffff)
- checksum -= 0xffff;
- return (~checksum) & 0xffff;
- }
- int ip_checksum_ok(const void *addr, uint nbytes)
- {
- return !(compute_ip_checksum(addr, nbytes) & 0xfffe);
- }
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