u-boot/net/dns.h
Denis Pynkin 704f3acfcf net: Use packed structures for networking
PXE boot is broken with GCC 7.1 due option '-fstore-merging' enabled
by default for '-O2':

BOOTP broadcast 1
data abort
pc : [<8ff8bb30>]          lr : [<00004f1f>]
reloc pc : [<17832b30>]    lr : [<878abf1f>]
sp : 8f558bc0  ip : 00000000     fp : 8ffef5a4
r10: 8ffed248  r9 : 8f558ee0     r8 : 8ffef594
r7 : 0000000e  r6 : 8ffed700     r5 : 00000000  r4 : 8ffed74e
r3 : 00060101  r2 : 8ffed230     r1 : 8ffed706  r0 : 00000ddd
Flags: nzcv  IRQs off  FIQs off  Mode SVC_32
Resetting CPU ...

Core reason is usage of structures for network headers without packed
attribute.

Reviewed-by: Yauheni Kaliuta <yauheni.kaliuta@redhat.com>
Signed-off-by: Denis Pynkin <denis.pynkin@collabora.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
2017-08-07 15:18:31 -05:00

36 lines
792 B
C

/*
* (C) Masami Komiya <mkomiya@sonare.it> 2005
* Copyright 2009, Robin Getz <rgetz@blackfin.uclinux.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __DNS_H__
#define __DNS_H__
#define DNS_SERVICE_PORT 53
#define DNS_TIMEOUT 10000UL
/* http://en.wikipedia.org/wiki/List_of_DNS_record_types */
enum dns_query_type {
DNS_A_RECORD = 0x01,
DNS_CNAME_RECORD = 0x05,
DNS_MX_RECORD = 0x0f,
};
/*
* DNS network packet
*/
struct header {
uint16_t tid; /* Transaction ID */
uint16_t flags; /* Flags */
uint16_t nqueries; /* Questions */
uint16_t nanswers; /* Answers */
uint16_t nauth; /* Authority PRs */
uint16_t nother; /* Other PRs */
unsigned char data[1]; /* Data, variable length */
} __attribute__((packed));
void dns_start(void); /* Begin DNS */
#endif