util: Introduce hton*_constant() in place of #ifdefs
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
Stefano Brivio
parent
6d011c1faa
commit
f5a950115b
2 changed files with 24 additions and 63 deletions
48
dhcpv6.c
48
dhcpv6.c
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@ -39,37 +39,21 @@
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*/
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struct opt_hdr {
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uint16_t t;
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#if __BYTE_ORDER == __BIG_ENDIAN
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# define OPT_CLIENTID 1
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# define OPT_SERVERID 2
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# define OPT_IA_NA 3
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# define OPT_IA_TA 4
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# define OPT_IAAADR 5
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# define OPT_STATUS_CODE 13
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# define STATUS_NOTONLINK 4
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# define OPT_DNS_SERVERS 23
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# define OPT_DNS_SEARCH 24
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#else
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# define OPT_CLIENTID __bswap_constant_16(1)
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# define OPT_SERVERID __bswap_constant_16(2)
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# define OPT_IA_NA __bswap_constant_16(3)
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# define OPT_IA_TA __bswap_constant_16(4)
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# define OPT_IAAADR __bswap_constant_16(5)
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# define OPT_STATUS_CODE __bswap_constant_16(13)
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# define STATUS_NOTONLINK __bswap_constant_16(4)
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# define OPT_DNS_SERVERS __bswap_constant_16(23)
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# define OPT_DNS_SEARCH __bswap_constant_16(24)
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#endif
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# define OPT_CLIENTID htons_constant(1)
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# define OPT_SERVERID htons_constant(2)
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# define OPT_IA_NA htons_constant(3)
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# define OPT_IA_TA htons_constant(4)
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# define OPT_IAAADR htons_constant(5)
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# define OPT_STATUS_CODE htons_constant(13)
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# define STATUS_NOTONLINK htons_constant(4)
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# define OPT_DNS_SERVERS htons_constant(23)
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# define OPT_DNS_SEARCH htons_constant(24)
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#define STR_NOTONLINK "Prefix not appropriate for link."
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uint16_t l;
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} __attribute__((packed));
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#if __BYTE_ORDER == __BIG_ENDIAN
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# define OPT_SIZE_CONV(x) (x)
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#else
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# define OPT_SIZE_CONV(x) (__bswap_constant_16(x))
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#endif
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# define OPT_SIZE_CONV(x) (htons_constant(x))
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#define OPT_SIZE(x) OPT_SIZE_CONV(sizeof(struct opt_##x) - \
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sizeof(struct opt_hdr))
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#define OPT_VSIZE(x) (sizeof(struct opt_##x) - \
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@ -103,19 +87,11 @@ struct opt_server_id {
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uint8_t duid_lladdr[ETH_ALEN];
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} __attribute__ ((packed));
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#if __BYTE_ORDER == __BIG_ENDIAN
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#define SERVER_ID { \
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{ OPT_SERVERID, OPT_SIZE(server_id) }, \
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DUID_TYPE_LLT, ARPHRD_ETHER, 0, { 0 } \
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htons_constant(DUID_TYPE_LLT), \
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htons_constant(ARPHRD_ETHER), 0, { 0 } \
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}
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#else
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#define SERVER_ID { \
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{ OPT_SERVERID, OPT_SIZE(server_id) }, \
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__bswap_constant_16(DUID_TYPE_LLT), \
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__bswap_constant_16(ARPHRD_ETHER), \
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0, { 0 } \
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}
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#endif
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/**
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* struct opt_ia_na - Identity Association for Non-temporary Addresses Option
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37
util.h
37
util.h
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@ -69,6 +69,14 @@
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#define MAC_ZERO ((uint8_t [ETH_ALEN]){ 0 })
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#define MAC_IS_ZERO(addr) (!memcmp((addr), MAC_ZERO, ETH_ALEN))
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#if __BYTE_ORDER == __BIG_ENDIAN
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#define htons_constant(x) (x)
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#define htonl_constant(x) (x)
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#else
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#define htons_constant(x) (__bswap_constant_16(x))
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#define htonl_constant(x) (__bswap_constant_32(x))
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#endif
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#define IN4_IS_ADDR_UNSPECIFIED(a) \
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((a)->s_addr == htonl(INADDR_ANY))
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#define IN4_IS_ADDR_BROADCAST(a) \
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@ -79,13 +87,8 @@
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(IN_MULTICAST(ntohl((a)->s_addr)))
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#define IN4_ARE_ADDR_EQUAL(a, b) \
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(((struct in_addr *)(a))->s_addr == ((struct in_addr *)b)->s_addr)
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#if __BYTE_ORDER == __BIG_ENDIAN
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#define IN4ADDR_LOOPBACK_INIT \
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{ .s_addr = INADDR_LOOPBACK }
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#else
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#define IN4ADDR_LOOPBACK_INIT \
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{ .s_addr = __bswap_constant_32(INADDR_LOOPBACK) }
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#endif
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{ .s_addr = htonl_constant(INADDR_LOOPBACK) }
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#define NS_FN_STACK_SIZE (RLIMIT_STACK_VAL * 1024 / 8)
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int do_clone(int (*fn)(void *), char *stack_area, size_t stack_size, int flags,
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@ -99,37 +102,19 @@ int do_clone(int (*fn)(void *), char *stack_area, size_t stack_size, int flags,
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(void *)(arg)); \
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} while (0)
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#if __BYTE_ORDER == __BIG_ENDIAN
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#define L2_BUF_ETH_IP4_INIT \
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{ \
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.h_dest = { 0 }, \
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.h_source = { 0 }, \
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.h_proto = ETH_P_IP, \
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.h_proto = htons_constant(ETH_P_IP), \
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}
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#else
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#define L2_BUF_ETH_IP4_INIT \
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{ \
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.h_dest = { 0 }, \
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.h_source = { 0 }, \
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.h_proto = __bswap_constant_16(ETH_P_IP), \
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}
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#endif
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#if __BYTE_ORDER == __BIG_ENDIAN
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#define L2_BUF_ETH_IP6_INIT \
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{ \
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.h_dest = { 0 }, \
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.h_source = { 0 }, \
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.h_proto = ETH_P_IPV6, \
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.h_proto = htons_constant(ETH_P_IPV6), \
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}
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#else
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#define L2_BUF_ETH_IP6_INIT \
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{ \
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.h_dest = { 0 }, \
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.h_source = { 0 }, \
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.h_proto = __bswap_constant_16(ETH_P_IPV6), \
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}
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#endif
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#define L2_BUF_IP4_INIT(proto) \
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{ \
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