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net: Add util to check if IPv4 address is part of a subnet

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Change-Id: I6005861a4c4085b6c17ded03fda38a567a4e504a
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
This commit is contained in:
Jukka Rissanen 2016-05-23 17:21:09 +03:00
commit 702ea43621
3 changed files with 47 additions and 0 deletions
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9
include/net/yaip/net_if.h
View file

@ -334,6 +334,15 @@ struct in6_addr *net_if_ipv6_get_ll(struct net_if *iface,
*/ */
struct net_if *net_if_get_default(void); struct net_if *net_if_get_default(void);
/**
* @brief Check if the given IPv4 address belongs to local subnet.
* @param iface Interface to use. Must be a valid pointer to an interface.
* @param addr IPv4 address
* @return True if address is part of local subnet, false otherwise.
*/
bool net_if_ipv4_addr_mask_cmp(struct net_if *iface,
struct in_addr *addr);
/** /**
* @brief Set IPv4 netmask for an interface. * @brief Set IPv4 netmask for an interface.
* @param iface Interface to use. * @param iface Interface to use.

15
include/net/yaip/net_ip.h
View file

@ -351,6 +351,21 @@ static inline const struct in_addr *net_ipv4_broadcast_address(void)
return net_if_ipv4_broadcast_addr(); return net_if_ipv4_broadcast_addr();
} }
struct net_if;
extern bool net_if_ipv4_addr_mask_cmp(struct net_if *iface,
struct in_addr *addr);
/** @brief Check if the given address belongs to same subnet that
* has been configured for the interface.
*
* @return True if address is in same subnet, false otherwise.
*/
static inline bool net_ipv4_addr_mask_cmp(struct net_if *iface,
struct in_addr *addr)
{
return net_if_ipv4_addr_mask_cmp(iface, addr);
}
#ifdef __cplusplus #ifdef __cplusplus
} }
#endif #endif

23
net/yaip/net_if.c
View file

@ -227,6 +227,29 @@ const struct in_addr *net_if_ipv4_broadcast_addr(void)
#endif #endif
} }
bool net_if_ipv4_addr_mask_cmp(struct net_if *iface,
struct in_addr *addr)
{
#if defined(CONFIG_NET_IPV4)
uint32_t subnet = ntohl(addr->s_addr[0]) &
ntohl(iface->ipv4.netmask.s_addr[0]);
int i;
for (i = 0; i < NET_IF_MAX_IPV4_ADDR; i++) {
if (!iface->ipv4.unicast[i].is_used ||
iface->ipv4.unicast[i].address.family != AF_INET) {
continue;
}
if ((ntohl(iface->ipv4.unicast[i].address.in_addr.s_addr[0]) &
ntohl(iface->ipv4.netmask.s_addr[0])) == subnet) {
return true;
}
}
#endif
return false;
}
struct in6_addr *net_if_ipv6_get_ll(struct net_if *iface, struct in6_addr *net_if_ipv6_get_ll(struct net_if *iface,
enum net_addr_state addr_state) enum net_addr_state addr_state)
{ {