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network: do not remove localhost address
Managing loopback interfaces by networkd is not recommended, but supporeted. Even such spurious situation, do not drop the localhost addresses.
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@ -121,6 +121,19 @@ int in_addr_is_localhost(int family, const union in_addr_union *u) {
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return -EAFNOSUPPORT;
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}
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int in_addr_is_localhost_one(int family, const union in_addr_union *u) {
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assert(u);
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if (family == AF_INET)
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/* 127.0.0.1 */
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return be32toh(u->in.s_addr) == UINT32_C(0x7F000001);
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if (family == AF_INET6)
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return IN6_IS_ADDR_LOOPBACK(&u->in6); /* lgtm [cpp/potentially-dangerous-function] */
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return -EAFNOSUPPORT;
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}
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bool in6_addr_is_ipv4_mapped_address(const struct in6_addr *a) {
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return a->s6_addr32[0] == 0 &&
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a->s6_addr32[1] == 0 &&
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@ -49,6 +49,7 @@ bool in6_addr_is_link_local_all_nodes(const struct in6_addr *a);
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bool in4_addr_is_localhost(const struct in_addr *a);
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int in_addr_is_localhost(int family, const union in_addr_union *u);
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int in_addr_is_localhost_one(int family, const union in_addr_union *u);
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bool in4_addr_is_local_multicast(const struct in_addr *a);
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bool in4_addr_is_non_local(const struct in_addr *a);
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@ -854,6 +854,10 @@ int link_drop_foreign_addresses(Link *link) {
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if (address->family == AF_INET6 && in6_addr_is_link_local(&address->in_addr.in6))
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continue;
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/* Do not remove localhost address (127.0.0.1 and ::1) */
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if (link->flags & IFF_LOOPBACK && in_addr_is_localhost_one(address->family, &address->in_addr) > 0)
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continue;
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/* Ignore addresses we configured. */
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if (address->source != NETWORK_CONFIG_SOURCE_FOREIGN)
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continue;
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