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Diffstat (limited to 'src/network/networkd-link.c')
-rw-r--r--src/network/networkd-link.c135
1 files changed, 60 insertions, 75 deletions
diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c
index 00c57b2960..c37532bb73 100644
--- a/src/network/networkd-link.c
+++ b/src/network/networkd-link.c
@@ -111,16 +111,26 @@ static bool link_ipv4_forward_enabled(Link *link) {
if (!link->network)
return false;
+ if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
+ return false;
+
return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
}
static bool link_ipv6_forward_enabled(Link *link) {
+
+ if (!socket_ipv6_is_supported())
+ return false;
+
if (link->flags & IFF_LOOPBACK)
return false;
if (!link->network)
return false;
+ if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
+ return false;
+
return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
}
@@ -147,6 +157,10 @@ bool link_ipv6_accept_ra_enabled(Link *link) {
}
static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
+
+ if (!socket_ipv6_is_supported())
+ return _IPV6_PRIVACY_EXTENSIONS_INVALID;
+
if (link->flags & IFF_LOOPBACK)
return _IPV6_PRIVACY_EXTENSIONS_INVALID;
@@ -1847,55 +1861,43 @@ static int link_enter_join_netdev(Link *link) {
}
static int link_set_ipv4_forward(Link *link) {
- const char *p = NULL, *v;
int r;
- if (link->flags & IFF_LOOPBACK)
+ if (!link_ipv4_forward_enabled(link))
return 0;
- if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
- return 0;
+ /* We propagate the forwarding flag from one interface to the
+ * global setting one way. This means: as long as at least one
+ * interface was configured at any time that had IP forwarding
+ * enabled the setting will stay on for good. We do this
+ * primarily to keep IPv4 and IPv6 packet forwarding behaviour
+ * somewhat in sync (see below). */
- p = strjoina("/proc/sys/net/ipv4/conf/", link->ifname, "/forwarding");
- v = one_zero(link_ipv4_forward_enabled(link));
-
- r = write_string_file(p, v, 0);
- 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);
- }
+ r = write_string_file("/proc/sys/net/ipv4/ip_forward", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
+ if (r < 0)
+ log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
return 0;
}
static int link_set_ipv6_forward(Link *link) {
- 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)
+ if (!link_ipv6_forward_enabled(link))
return 0;
- p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/forwarding");
- v = one_zero(link_ipv6_forward_enabled(link));
+ /* On Linux, the IPv6 stack does not not know a per-interface
+ * packet forwarding setting: either packet forwarding is on
+ * for all, or off for all. We hence don't bother with a
+ * per-interface setting, but simply propagate the interface
+ * flag, if it is set, to the global flag, one-way. Note that
+ * while IPv4 would allow a per-interface flag, we expose the
+ * same behaviour there and also propagate the setting from
+ * one to all, to keep things simple (see above). */
- r = write_string_file(p, v, 0);
- 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");
- }
+ r = write_string_file("/proc/sys/net/ipv6/conf/all/forwarding", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
+ if (r < 0)
+ log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
return 0;
}
@@ -1906,25 +1908,16 @@ static int link_set_ipv6_privacy_extensions(Link *link) {
const char *p = NULL;
int r;
- /* Make this a NOP if IPv6 is not available */
- if (!socket_ipv6_is_supported())
- return 0;
-
s = link_ipv6_privacy_extensions(link);
- if (s == _IPV6_PRIVACY_EXTENSIONS_INVALID)
+ if (s < 0)
return 0;
p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/use_tempaddr");
- xsprintf(buf, "%u", link->network->ipv6_privacy_extensions);
-
- r = write_string_file(p, buf, 0);
- if (r < 0) {
- /* If the right value is set anyway, don't complain */
- if (verify_one_line_file(p, buf) > 0)
- return 0;
+ xsprintf(buf, "%u", (unsigned) link->network->ipv6_privacy_extensions);
+ r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
+ if (r < 0)
log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
- }
return 0;
}
@@ -1940,23 +1933,21 @@ static int link_set_ipv6_accept_ra(Link *link) {
if (link->flags & IFF_LOOPBACK)
return 0;
- p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/accept_ra");
+ if (!link->network)
+ return 0;
- /* we handle router advertisments ourselves, tell the kernel to GTFO */
- r = write_string_file(p, "0", 0);
- if (r < 0) {
- /* If the right value is set anyway, don't complain */
- if (verify_one_line_file(p, "0") > 0)
- return 0;
+ p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/accept_ra");
+ /* We handle router advertisments ourselves, tell the kernel to GTFO */
+ r = write_string_file(p, "0", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
+ if (r < 0)
log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
- }
return 0;
}
static int link_set_ipv6_dad_transmits(Link *link) {
- char buf[DECIMAL_STR_MAX(unsigned) + 1];
+ char buf[DECIMAL_STR_MAX(int) + 1];
const char *p = NULL;
int r;
@@ -1967,27 +1958,24 @@ static int link_set_ipv6_dad_transmits(Link *link) {
if (link->flags & IFF_LOOPBACK)
return 0;
+ if (!link->network)
+ return 0;
+
if (link->network->ipv6_dad_transmits < 0)
return 0;
p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/dad_transmits");
+ xsprintf(buf, "%i", link->network->ipv6_dad_transmits);
- xsprintf(buf, "%u", link->network->ipv6_dad_transmits);
-
- r = write_string_file(p, buf, 0);
- if (r < 0) {
- /* If the right value is set anyway, don't complain */
- if (verify_one_line_file(p, buf) > 0)
- return 0;
-
+ r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
+ if (r < 0)
log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
- }
return 0;
}
static int link_set_ipv6_hop_limit(Link *link) {
- char buf[DECIMAL_STR_MAX(unsigned) + 1];
+ char buf[DECIMAL_STR_MAX(int) + 1];
const char *p = NULL;
int r;
@@ -1998,21 +1986,18 @@ static int link_set_ipv6_hop_limit(Link *link) {
if (link->flags & IFF_LOOPBACK)
return 0;
+ if (!link->network)
+ return 0;
+
if (link->network->ipv6_hop_limit < 0)
return 0;
p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/hop_limit");
+ xsprintf(buf, "%i", link->network->ipv6_hop_limit);
- xsprintf(buf, "%u", link->network->ipv6_hop_limit);
-
- r = write_string_file(p, buf, 0);
- if (r < 0) {
- /* If the right value is set anyway, don't complain */
- if (verify_one_line_file(p, buf) > 0)
- return 0;
-
+ r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
+ if (r < 0)
log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
- }
return 0;
}
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