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Move some useful internal logic from recvfrom.c and udp_callback.c and put them in ip.h where they can be used more generally

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This commit is contained in:
Gregory Nutt
2015-02-17 07:37:44 -06:00
parent 686dcbb79c
commit db741dd695
3 changed files with 60 additions and 21 deletions
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include/nuttx/net/ip.h
+38 -5
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@@ -327,18 +327,51 @@ EXTERN const net_ipv6addr_t g_ipv6_llnetmask; /* Netmask for local link addres
((uint16_t*)(addr))[7] = HTONS((addr7)); \
} while (0)
/****************************************************************************
* Macro: ip6_map_ipv4addr
*
* Description:
* Hybrid dual-stack IPv6/IPv4 implementations recognize a special class
* of addresses, the IPv4-mapped IPv6 addresses. These addresses consist
* of:
*
* 1. An 80-bit prefix of zeros,
* 2. Te next 16 bits are one, and
* 3. he remaining, least-significant 32 bits contain the IPv4 address.
*
* This macro encodes an IPv4 address in an IPv6 address in this fashion.
*
* Input Parameters:
* ipv4addr - The IPv4 address to be mapped (scalar)
* ipv6addr - The IPv6 address in which to map the IPv4 address (array)
*
* Returned Value:
* None
*
****************************************************************************/
#define ip6_map_ipv4addr(ipv4addr, ipv6addr) \
do \
{ \
memset(ipv6addr, 0, 5 * sizeof(uint16_t)); \
ipv6addr[5] = 0xffff; \
ipv6addr[6] = (uint16_t)((uint32_t)ip4addr >> 16); \
ipv6addr[7] = (uint16_t)ip4addr & 0xffff; \
} \
while (0)
/****************************************************************************
* Macro: ip6_get_ipv4addr
*
* Description:
* Decode an encoded IPv4 address.
* Decode an IPv4-mapped IPv6 address.
*
* Input Parameters:
* ipv6addr - The IPv6 address (net_ipv6addr_t) containing the encoded
* ipv6addr - The IPv6 address (net_ipv6addr_t array) containing the mapped
* IPv4 address
*
* Returned Value:
* The decode IPv4 addreses (in_addr_t)
* The decoded IPv4 address (scalar in_addr_t)
*
****************************************************************************/
@@ -352,13 +385,13 @@ EXTERN const net_ipv6addr_t g_ipv6_llnetmask; /* Netmask for local link addres
* Macro: ip6_is_ipv4addr
*
* Description:
* Test if an IPv6 is an encoded IPv4 address.
* Test if an IPv6 is an IPv4-mapped IPv6 address.
*
* Input Parameters:
* ipv6addr - The IPv6 address to be tested
*
* Returned Value:
* True is returned if ipv6addr holds an encoded IPv4 address.
* True is returned if ipv6addr holds a mapped IPv4 address.
*
****************************************************************************/