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tests: net: ip-addr: Add test case verifying default iface is preferred

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Add a test case which validates that if two network interfaces are
equally good wrt net mask for LL IPv4 communication, the default
interface is preferred.

Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>
This commit is contained in:
Robert Lubos 2024-11-27 13:45:32 +01:00 • committed by Benjamin Cabé
commit 0ee17d9aa3
1 changed files with 40 additions and 0 deletions
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40
tests/net/ip-addr/src/main.c
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@ -371,6 +371,46 @@ ZTEST(ip_addr_fn, test_ipv6_addresses)
"IPv6 removing address failed\n");
}
ZTEST(ip_addr_fn, test_ipv4_ll_address_select_default_first)
{
struct net_if *iface;
const struct in_addr *out;
struct net_if_addr *ifaddr;
struct in_addr lladdr4_1 = { { { 169, 254, 0, 1 } } };
struct in_addr lladdr4_2 = { { { 169, 254, 0, 3 } } };
struct in_addr netmask = { { { 255, 255, 0, 0 } } };
struct in_addr dst4 = { { { 169, 254, 0, 2 } } };
ifaddr = net_if_ipv4_addr_add(default_iface, &lladdr4_1, NET_ADDR_MANUAL, 0);
zassert_not_null(ifaddr, "IPv4 interface address add failed");
zassert_true(net_ipv4_is_my_addr(&lladdr4_1),
"My IPv4 address check failed");
net_if_ipv4_set_netmask_by_addr(default_iface, &lladdr4_1, &netmask);
ifaddr = net_if_ipv4_addr_add(second_iface, &lladdr4_2, NET_ADDR_MANUAL, 0);
zassert_not_null(ifaddr, "IPv4 interface address add failed");
zassert_true(net_ipv4_is_my_addr(&lladdr4_2),
"My IPv4 address check failed");
net_if_ipv4_set_netmask_by_addr(second_iface, &lladdr4_2, &netmask);
/* In case two network interfaces have two equally good addresses
* (same net mask), default interface should be selected.
*/
out = net_if_ipv4_select_src_addr(NULL, &dst4);
iface = net_if_ipv4_select_src_iface(&dst4);
zassert_not_null(out, "IPv4 src addr selection failed, iface %p\n",
iface);
DBG("Selected IPv4 address %s, iface %p\n", net_sprint_ipv4_addr(out),
iface);
zassert_equal_ptr(iface, default_iface, "Wrong iface selected");
zassert_equal(out->s_addr, lladdr4_1.s_addr,
"IPv4 wrong src address selected, iface %p\n", iface);
}
ZTEST(ip_addr_fn, test_ipv4_ll_address_select)
{
struct net_if *iface;