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lib/net_utils.c
1.95 KB
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// SPDX-License-Identifier: GPL-2.0+ |
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/* * 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 |
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*/ #include <common.h> |
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struct in_addr string_to_ip(const char *s) |
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{ |
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struct in_addr addr; |
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char *e; int i; |
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addr.s_addr = 0; |
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if (s == NULL) |
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return addr; |
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for (addr.s_addr = 0, i = 0; i < 4; ++i) { |
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ulong val = s ? simple_strtoul(s, &e, 10) : 0; |
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if (val > 255) { addr.s_addr = 0; return addr; } |
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if (i != 3 && *e != '.') { addr.s_addr = 0; return addr; } |
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addr.s_addr <<= 8; addr.s_addr |= (val & 0xFF); |
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if (s) { s = (*e) ? e+1 : e; } } |
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addr.s_addr = htonl(addr.s_addr); return addr; |
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} |
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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; } } |
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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); } |