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util: Introduce hton*_constant() in place of #ifdefs

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We have several places where we have fairly ugly #ifdefs on __BYTE_ORDER
where we need network order values in a constant expression (so we can't
use htons() or htonl()).  We can do this more cleanly by using a single
__BYTE_ORDER ifdef to define htons_constant() and htonl_constant()
macros, then using those in all the other places.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
David Gibson
2023-01-06 11:43:12 +11:00
committed by Stefano Brivio
parent 6d011c1faa
commit f5a950115b
2 changed files with 24 additions and 63 deletions
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50
dhcpv6.c
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@@ -39,37 +39,21 @@
*/
struct opt_hdr {
uint16_t t;
#if __BYTE_ORDER == __BIG_ENDIAN
# define OPT_CLIENTID 1
# define OPT_SERVERID 2
# define OPT_IA_NA 3
# define OPT_IA_TA 4
# define OPT_IAAADR 5
# define OPT_STATUS_CODE 13
# define STATUS_NOTONLINK 4
# define OPT_DNS_SERVERS 23
# define OPT_DNS_SEARCH 24
#else
# define OPT_CLIENTID __bswap_constant_16(1)
# define OPT_SERVERID __bswap_constant_16(2)
# define OPT_IA_NA __bswap_constant_16(3)
# define OPT_IA_TA __bswap_constant_16(4)
# define OPT_IAAADR __bswap_constant_16(5)
# define OPT_STATUS_CODE __bswap_constant_16(13)
# define STATUS_NOTONLINK __bswap_constant_16(4)
# define OPT_DNS_SERVERS __bswap_constant_16(23)
# define OPT_DNS_SEARCH __bswap_constant_16(24)
#endif
# define OPT_CLIENTID htons_constant(1)
# define OPT_SERVERID htons_constant(2)
# define OPT_IA_NA htons_constant(3)
# define OPT_IA_TA htons_constant(4)
# define OPT_IAAADR htons_constant(5)
# define OPT_STATUS_CODE htons_constant(13)
# define STATUS_NOTONLINK htons_constant(4)
# define OPT_DNS_SERVERS htons_constant(23)
# define OPT_DNS_SEARCH htons_constant(24)
#define STR_NOTONLINK "Prefix not appropriate for link."
uint16_t l;
} __attribute__((packed));
#if __BYTE_ORDER == __BIG_ENDIAN
# define OPT_SIZE_CONV(x) (x)
#else
# define OPT_SIZE_CONV(x) (__bswap_constant_16(x))
#endif
# define OPT_SIZE_CONV(x) (htons_constant(x))
#define OPT_SIZE(x) OPT_SIZE_CONV(sizeof(struct opt_##x) - \
sizeof(struct opt_hdr))
#define OPT_VSIZE(x) (sizeof(struct opt_##x) - \
@@ -103,19 +87,11 @@ struct opt_server_id {
uint8_t duid_lladdr[ETH_ALEN];
} __attribute__ ((packed));
#if __BYTE_ORDER == __BIG_ENDIAN
#define SERVER_ID { \
#define SERVER_ID { \
{ OPT_SERVERID, OPT_SIZE(server_id) }, \
DUID_TYPE_LLT, ARPHRD_ETHER, 0, { 0 } \
htons_constant(DUID_TYPE_LLT), \
htons_constant(ARPHRD_ETHER), 0, { 0 } \
}
#else
#define SERVER_ID { \
{ OPT_SERVERID, OPT_SIZE(server_id) }, \
__bswap_constant_16(DUID_TYPE_LLT), \
__bswap_constant_16(ARPHRD_ETHER), \
0, { 0 } \
}
#endif
/**
* struct opt_ia_na - Identity Association for Non-temporary Addresses Option