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net: ip: select src ip address with valid scope for mcast dst

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IPv6 source address selection procedure selected link-local address
for any muticast destination with other scope than mesh-local. It
was a cause of problems for broader multicast scopes like admin-, or
site-local. For such broader scopes source address must be at least
as broad as the scope of multicast destination.

This patch updates IPv6 source address selection procedure. Now
link-local address is selected only for link-local destinations,
including multicast destinations. For broader destination scope,
source address with broader scope is selected.

Signed-off-by: Hubert Miś <hubert.mis@nordicsemi.no>
This commit is contained in:
Hubert Miś 2021-03-29 18:33:01 +02:00 • committed by Jukka Rissanen
commit a41a3b703d
1 changed files with 1 additions and 3 deletions
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4
subsys/net/ip/net_if.c
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@ -2686,9 +2686,7 @@ const struct in6_addr *net_if_ipv6_select_src_addr(struct net_if *dst_iface,
k_mutex_lock(&lock, K_FOREVER); k_mutex_lock(&lock, K_FOREVER);
if (!net_ipv6_is_ll_addr(dst) && (!net_ipv6_is_addr_mcast(dst) || if (!net_ipv6_is_ll_addr(dst) && !net_ipv6_is_addr_mcast_link(dst)) {
net_ipv6_is_addr_mcast_mesh(dst))) {
/* If caller has supplied interface, then use that */ /* If caller has supplied interface, then use that */
if (dst_iface) { if (dst_iface) {
src = net_if_ipv6_get_best_match(dst_iface, dst, src = net_if_ipv6_get_best_match(dst_iface, dst,