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-rw-r--r--src/network/networkd-link.c32
1 files changed, 26 insertions, 6 deletions
diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c
index f67a19e50b..eb07e12773 100644
--- a/src/network/networkd-link.c
+++ b/src/network/networkd-link.c
@@ -1486,35 +1486,55 @@ static int link_enter_join_netdev(Link *link) {
}
static int link_set_ipv4_forward(Link *link) {
- const char *p = NULL;
+ const char *p = NULL, *v;
int r;
+ if (link->flags & IFF_LOOPBACK)
+ return 0;
+
if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
return 0;
p = strjoina("/proc/sys/net/ipv4/conf/", link->ifname, "/forwarding");
- r = write_string_file_no_create(p, one_zero(link_ipv4_forward_enabled(link)));
- if (r < 0)
+ v = one_zero(link_ipv4_forward_enabled(link));
+
+ r = write_string_file_no_create(p, v);
+ if (r < 0) {
+ /* If the right value is set anyway, don't complain */
+ if (verify_one_line_file(p, v) > 0)
+ return 0;
+
log_link_warning_errno(link, r, "Cannot configure IPv4 forwarding for interface %s: %m", link->ifname);
+ }
return 0;
}
static int link_set_ipv6_forward(Link *link) {
- const char *p = NULL;
+ const char *p = NULL, *v = NULL;
int r;
/* Make this a NOP if IPv6 is not available */
if (!socket_ipv6_is_supported())
return 0;
+ if (link->flags & IFF_LOOPBACK)
+ return 0;
+
if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
return 0;
p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/forwarding");
- r = write_string_file_no_create(p, one_zero(link_ipv6_forward_enabled(link)));
- if (r < 0)
+ v = one_zero(link_ipv6_forward_enabled(link));
+
+ r = write_string_file_no_create(p, v);
+ if (r < 0) {
+ /* If the right value is set anyway, don't complain */
+ if (verify_one_line_file(p, v) > 0)
+ return 0;
+
log_link_warning_errno(link, r, "Cannot configure IPv6 forwarding for interface: %m");
+ }
return 0;
}