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IPv4: splitted IPv4 header fields version/len and tos, made macros depend on BYTE_ORDER to prevent unnecessary calls to htons()

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Simon Goldschmidt 2011-07-26 20:55:32 +02:00 committed by goldsimon
parent 5b899dd85b
commit 38f619dd6f
2 changed files with 21 additions and 8 deletions
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5
src/core/ipv4/ip.c
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@ -659,9 +659,10 @@ err_t ip_output_if_opt(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
chk_sum += ip4_addr_get_u32(&iphdr->dest) >> 16;
#endif /* CHECKSUM_GEN_IP_INLINE */
IPH_VHLTOS_SET(iphdr, 4, ip_hlen / 4, tos);
IPH_VHL_SET(iphdr, 4, ip_hlen / 4);
IPH_TOS_SET(iphdr, tos);
#if CHECKSUM_GEN_IP_INLINE
chk_sum += iphdr->_v_hl_tos;
chk_sum += LWIP_MAKE_U16(tos, iphdr->_v_hl);
#endif /* CHECKSUM_GEN_IP_INLINE */
IPH_LEN_SET(iphdr, htons(p->tot_len));
#if CHECKSUM_GEN_IP_INLINE

24
src/include/ipv4/lwip/ip.h
View File

@ -114,8 +114,10 @@ struct ip_pcb {
#endif
PACK_STRUCT_BEGIN
struct ip_hdr {
/* version / header length / type of service */
PACK_STRUCT_FIELD(u16_t _v_hl_tos);
/* version / header length */
PACK_STRUCT_FIELD(u8_t _v_hl);
/* type of service */
PACK_STRUCT_FIELD(u8_t _tos);
/* total length */
PACK_STRUCT_FIELD(u16_t _len);
/* identification */
@ -141,9 +143,14 @@ PACK_STRUCT_END
# include "arch/epstruct.h"
#endif
#define IPH_V(hdr) (ntohs((hdr)->_v_hl_tos) >> 12)
#define IPH_HL(hdr) ((ntohs((hdr)->_v_hl_tos) >> 8) & 0x0f)
#define IPH_TOS(hdr) (ntohs((hdr)->_v_hl_tos) & 0xff)
#if BYTE_ORDER == LITTLE_ENDIAN
#define IPH_V(hdr) ((hdr)->_v_hl >> 4)
#define IPH_HL(hdr) ((hdr)->_v_hl & 0x0f)
#else /* BYTE_ORDER == LITTLE_ENDIAN */
#define IPH_V(hdr) ((hdr)->_v_hl & 0x0f)
#define IPH_HL(hdr) ((hdr)->_v_hl >> 4)
#endif /* BYTE_ORDER == LITTLE_ENDIAN */
#define IPH_TOS(hdr) ((hdr)->_tos)
#define IPH_LEN(hdr) ((hdr)->_len)
#define IPH_ID(hdr) ((hdr)->_id)
#define IPH_OFFSET(hdr) ((hdr)->_offset)
@ -151,7 +158,12 @@ PACK_STRUCT_END
#define IPH_PROTO(hdr) ((hdr)->_proto)
#define IPH_CHKSUM(hdr) ((hdr)->_chksum)
#define IPH_VHLTOS_SET(hdr, v, hl, tos) (hdr)->_v_hl_tos = (htons(((v) << 12) | ((hl) << 8) | (tos)))
#if BYTE_ORDER == LITTLE_ENDIAN
#define IPH_VHL_SET(hdr, v, hl) (hdr)->_v_hl = (((v) << 4) | (hl))
#else /* BYTE_ORDER == LITTLE_ENDIAN */
#define IPH_VHL_SET(hdr, v, hl) (hdr)->_v_hl = ((v) | ((hl) << 4))
#endif /* BYTE_ORDER == LITTLE_ENDIAN */
#define IPH_TOS_SET(hdr, tos) (hdr)->_tos = (tos)
#define IPH_LEN_SET(hdr, len) (hdr)->_len = (len)
#define IPH_ID_SET(hdr, id) (hdr)->_id = (id)
#define IPH_OFFSET_SET(hdr, off) (hdr)->_offset = (off)