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net: IPv6 address utility funcs for network interface

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Added more functions to get proper IPv6 address from
a given network interface.

Change-Id: I5aecdb35eb549a0781949134ab4821dcb8ce9e7b
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
This commit is contained in:
Jukka Rissanen 2016-05-18 11:15:41 +03:00
commit 93f129060d
3 changed files with 224 additions and 0 deletions
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150
net/yaip/net_if.c
View file

@ -189,6 +189,156 @@ struct net_if_mcast_addr *net_if_ipv6_maddr_lookup(struct in6_addr *maddr)
return NULL;
}
struct in6_addr *net_if_ipv6_unspecified_addr(void)
{
#if defined(CONFIG_NET_IPV6)
static struct in6_addr addr = IN6ADDR_ANY_INIT;
return &addr;
#else
return NULL;
#endif
}
struct in6_addr *net_if_ipv6_get_ll(struct net_if *iface,
enum net_addr_state addr_state)
{
int i;
for (i = 0; i < NET_IF_MAX_IPV6_ADDR; i++) {
if (!iface->ipv6.unicast[i].is_used ||
(addr_state != NET_ADDR_ANY_STATE &&
iface->ipv6.unicast[i].addr_state != addr_state) ||
iface->ipv6.unicast[i].address.family != AF_INET6) {
continue;
}
if (net_is_ipv6_ll_addr(&iface->ipv6.unicast[i].address.in6_addr)) {
return &iface->ipv6.unicast[i].address.in6_addr;
}
}
return NULL;
}
static inline uint8_t get_length(struct in6_addr *src, struct in6_addr *dst)
{
uint8_t j, k, xor;
uint8_t len = 0;
for (j = 0; j < 16; j++) {
if (src->s6_addr[j] == dst->s6_addr[j]) {
len += 8;
} else {
xor = src->s6_addr[j] ^ dst->s6_addr[j];
for (k = 0; k < 8; k++) {
if (!(xor & 0x80)) {
len++;
xor <<= 1;
} else {
break;
}
}
break;
}
}
return len;
}
static inline bool is_proper_ipv6_address(struct net_if_addr *addr)
{
if (addr->is_used && addr->addr_state == NET_ADDR_PREFERRED &&
addr->address.family == AF_INET6 &&
!net_is_ipv6_ll_addr(&addr->address.in6_addr)) {
return true;
}
return false;
}
static inline struct in6_addr *net_if_ipv6_get_best_match(struct net_if *iface,
struct in6_addr *dst,
uint8_t *best_so_far)
{
#if defined(CONFIG_NET_IPV6)
struct in6_addr *src = NULL;
uint8_t i, len;
for (i = 0; i < NET_IF_MAX_IPV6_ADDR; i++) {
if (!is_proper_ipv6_address(&iface->ipv6.unicast[i])) {
continue;
}
len = get_length(dst,
&iface->ipv6.unicast[i].address.in6_addr);
if (len >= *best_so_far) {
*best_so_far = len;
src = &iface->ipv6.unicast[i].address.in6_addr;
}
}
return src;
#else
return NULL;
#endif
}
struct in6_addr *net_if_ipv6_select_src_addr(struct net_if *dst_iface,
struct in6_addr *dst)
{
#if defined(CONFIG_NET_IPV6)
struct in6_addr *src = NULL;
uint8_t best_match = 0;
struct net_if *iface;
if (!net_is_ipv6_ll_addr(dst) && !net_is_ipv6_addr_mcast(dst)) {
for (iface = __net_if_start;
!dst_iface && iface != __net_if_end;
iface++) {
struct in6_addr *addr;
addr = net_if_ipv6_get_best_match(iface, dst,
&best_match);
if (addr) {
src = addr;
}
}
/* If caller has supplied interface, then use that */
if (dst_iface) {
src = net_if_ipv6_get_best_match(dst_iface, dst,
&best_match);
}
} else {
for (iface = __net_if_start;
!dst_iface && iface != __net_if_end;
iface++) {
struct in6_addr *addr;
addr = net_if_ipv6_get_ll(iface, NET_ADDR_PREFERRED);
if (addr) {
src = addr;
break;
}
}
if (dst_iface) {
src = net_if_ipv6_get_ll(dst_iface, NET_ADDR_PREFERRED);
}
}
if (!src) {
return net_if_ipv6_unspecified_addr();
}
return src;
#else
return NULL;
#endif
}
struct net_if_addr *net_if_ipv4_addr_lookup(struct in_addr *addr)
{
struct net_if *iface;