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networkd: create "kernel" setting for IPForwarding

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In 5a8bcb674f71a20e95df55319b34c556638378ce, IPForwarding was introduced
to set forwarding flags on interfaces in .network files. networkd sets
forwarding options regardless of the previous setting, even if it was
set by e.g. sysctl. This commit creates a new option for IPForwarding,
"kernel", that preserves the sysctl settings rather than always setting
them.

See https://bugs.freedesktop.org/show_bug.cgi?id=89509 for the initial
bug report.
This commit is contained in:
Nick Owens 2015-05-01 11:48:08 -07:00
parent b30e7a269d
commit a70ec7f19f
3 changed files with 11 additions and 0 deletions
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6
src/network/networkd-link.c
View File

@ -1481,6 +1481,9 @@ static int link_set_ipv4_forward(Link *link) {
const char *p = NULL;
int r;
if (link->network->ip_forward == ADDRESS_FAMILY_KERNEL)
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)
@ -1497,6 +1500,9 @@ static int link_set_ipv6_forward(Link *link) {
if (!socket_ipv6_is_supported())
return 0;
if (link->network->ip_forward == ADDRESS_FAMILY_KERNEL)
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)

4
src/network/networkd-manager.c
View File

@ -853,6 +853,8 @@ const char *address_family_boolean_to_string(AddressFamilyBoolean b) {
return "ipv4";
if (b == ADDRESS_FAMILY_IPV6)
return "ipv6";
if (b == ADDRESS_FAMILY_KERNEL)
return "kernel";
return NULL;
}
@ -872,6 +874,8 @@ AddressFamilyBoolean address_family_boolean_from_string(const char *s) {
return ADDRESS_FAMILY_IPV4;
if (streq(s, "ipv6"))
return ADDRESS_FAMILY_IPV6;
if (streq(s, "kernel"))
return ADDRESS_FAMILY_KERNEL;
return _ADDRESS_FAMILY_BOOLEAN_INVALID;
}

1
src/network/networkd.h
View File

@ -60,6 +60,7 @@ typedef enum AddressFamilyBoolean {
ADDRESS_FAMILY_IPV4 = 1,
ADDRESS_FAMILY_IPV6 = 2,
ADDRESS_FAMILY_YES = 3,
ADDRESS_FAMILY_KERNEL = 4,
_ADDRESS_FAMILY_BOOLEAN_MAX,
_ADDRESS_FAMILY_BOOLEAN_INVALID = -1,
} AddressFamilyBoolean;