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Added ip_addr_netmask_valid() to check if a netmask is valid (starting with ones, then only zeros)

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This commit is contained in:
goldsimon 2010-07-05 14:20:58 +00:00
parent 2b355d6b34
commit 60a456f757
2 changed files with 35 additions and 3 deletions
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31
src/core/ipv4/ip_addr.c
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@ -51,7 +51,8 @@ const ip_addr_t ip_addr_broadcast = { IPADDR_BROADCAST };
* @param netif the network interface against which the address is checked * @param netif the network interface against which the address is checked
* @return returns non-zero if the address is a broadcast address * @return returns non-zero if the address is a broadcast address
*/ */
u8_t ip4_addr_isbroadcast(u32_t addr, const struct netif *netif) u8_t
ip4_addr_isbroadcast(u32_t addr, const struct netif *netif)
{ {
ip_addr_t ipaddr; ip_addr_t ipaddr;
ip4_addr_set_u32(&ipaddr, addr); ip4_addr_set_u32(&ipaddr, addr);
@ -80,6 +81,34 @@ u8_t ip4_addr_isbroadcast(u32_t addr, const struct netif *netif)
} }
} }
/** Checks if a netmask is valid (starting with ones, then only zeros)
*
* @param netmask the IPv4 netmask to check (in network byte order!)
* @return 1 if the netmask is valid, 0 if it is not
*/
u8_t
ip4_addr_netmask_valid(u32_t netmask)
{
u32_t mask;
u32_t nm_hostorder = lwip_htonl(netmask);
/* first, check for the first zero */
for (mask = 1U << 31 ; mask != 0; mask >>= 1) {
if ((nm_hostorder & mask) == 0) {
break;
}
}
/* then check that there is no one */
for (; mask != 0; mask >>= 1) {
if ((nm_hostorder & mask) != 0) {
/* there is a one after the first zero -> invalid */
return 0;
}
}
/* no one after the first zero -> valid */
return 1;
}
/* Here for now until needed in other places in lwIP */ /* Here for now until needed in other places in lwIP */
#ifndef isprint #ifndef isprint
#define in_range(c, lo, up) ((u8_t)c >= lo && (u8_t)c <= up) #define in_range(c, lo, up) ((u8_t)c >= lo && (u8_t)c <= up)

3
src/include/ipv4/lwip/ip_addr.h
View File

@ -202,6 +202,9 @@ extern const ip_addr_t ip_addr_broadcast;
#define ip_addr_isbroadcast(ipaddr, netif) ip4_addr_isbroadcast((ipaddr)->addr, (netif)) #define ip_addr_isbroadcast(ipaddr, netif) ip4_addr_isbroadcast((ipaddr)->addr, (netif))
u8_t ip4_addr_isbroadcast(u32_t addr, const struct netif *netif); u8_t ip4_addr_isbroadcast(u32_t addr, const struct netif *netif);
#define ip_addr_netmask_valid(netmask) ip4_addr_netmask_valid((netmask)->addr)
u8_t ip4_addr_netmask_valid(u32_t netmask);
#define ip_addr_ismulticast(addr1) (((addr1)->addr & PP_HTONL(0xf0000000UL)) == PP_HTONL(0xe0000000UL)) #define ip_addr_ismulticast(addr1) (((addr1)->addr & PP_HTONL(0xf0000000UL)) == PP_HTONL(0xe0000000UL))
#define ip_addr_islinklocal(addr1) (((addr1)->addr & PP_HTONL(0xffff0000UL)) == PP_HTONL(0xa9fe0000UL)) #define ip_addr_islinklocal(addr1) (((addr1)->addr & PP_HTONL(0xffff0000UL)) == PP_HTONL(0xa9fe0000UL))