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authorSusant Sahani <ssahani@users.noreply.github.com>2016-11-24 03:02:19 +0530
committerLennart Poettering <lennart@poettering.net>2016-11-23 22:32:19 +0100
commitd6fceaf1f7ff765bdc3b135f3d3676ec689da312 (patch)
treec460650afe13fa5f2e6a95373afa32355daf9bcc /src
parent99245111ac4b2b4275c8caeb03c14f7870afbb85 (diff)
networkd: handle MTU field in IPv6 RA (#4719)
This patch handles the custom MTU field in IPv6 RA. fixes RFE #4464
Diffstat (limited to 'src')
-rw-r--r--src/libsystemd/sd-netlink/netlink-types.c27
-rw-r--r--src/network/networkd-ndisc.c8
-rw-r--r--src/network/networkd-route.c14
-rw-r--r--src/network/networkd-route.h1
4 files changed, 47 insertions, 3 deletions
diff --git a/src/libsystemd/sd-netlink/netlink-types.c b/src/libsystemd/sd-netlink/netlink-types.c
index 1c10dd55a7..0f8b0cc70b 100644
--- a/src/libsystemd/sd-netlink/netlink-types.c
+++ b/src/libsystemd/sd-netlink/netlink-types.c
@@ -500,6 +500,28 @@ static const NLTypeSystem rtnl_address_type_system = {
.types = rtnl_address_types,
};
+/* RTM_METRICS --- array of struct rtattr with types of RTAX_* */
+
+static const NLType rtnl_route_metrics_types[] = {
+ [RTAX_MTU] = { .type = NETLINK_TYPE_U32 },
+ [RTAX_WINDOW] = { .type = NETLINK_TYPE_U32 },
+ [RTAX_RTT] = { .type = NETLINK_TYPE_U32 },
+ [RTAX_RTTVAR] = { .type = NETLINK_TYPE_U32 },
+ [RTAX_SSTHRESH] = { .type = NETLINK_TYPE_U32 },
+ [RTAX_CWND] = { .type = NETLINK_TYPE_U32 },
+ [RTAX_ADVMSS] = { .type = NETLINK_TYPE_U32 },
+ [RTAX_REORDERING] = { .type = NETLINK_TYPE_U32 },
+ [RTAX_HOPLIMIT] = { .type = NETLINK_TYPE_U32 },
+ [RTAX_INITCWND] = { .type = NETLINK_TYPE_U32 },
+ [RTAX_FEATURES] = { .type = NETLINK_TYPE_U32 },
+ [RTAX_RTO_MIN] = { .type = NETLINK_TYPE_U32 },
+};
+
+static const NLTypeSystem rtnl_route_metrics_type_system = {
+ .count = ELEMENTSOF(rtnl_route_metrics_types),
+ .types = rtnl_route_metrics_types,
+};
+
static const NLType rtnl_route_types[] = {
[RTA_DST] = { .type = NETLINK_TYPE_IN_ADDR }, /* 6? */
[RTA_SRC] = { .type = NETLINK_TYPE_IN_ADDR }, /* 6? */
@@ -508,9 +530,8 @@ static const NLType rtnl_route_types[] = {
[RTA_GATEWAY] = { .type = NETLINK_TYPE_IN_ADDR },
[RTA_PRIORITY] = { .type = NETLINK_TYPE_U32 },
[RTA_PREFSRC] = { .type = NETLINK_TYPE_IN_ADDR }, /* 6? */
-/*
- [RTA_METRICS] = { .type = NETLINK_TYPE_NESTED },
- [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
+ [RTA_METRICS] = { .type = NETLINK_TYPE_NESTED, .type_system = &rtnl_route_metrics_type_system},
+/* [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
*/
[RTA_FLOW] = { .type = NETLINK_TYPE_U32 }, /* 6? */
/*
diff --git a/src/network/networkd-ndisc.c b/src/network/networkd-ndisc.c
index 70283e5347..5320592f7a 100644
--- a/src/network/networkd-ndisc.c
+++ b/src/network/networkd-ndisc.c
@@ -56,6 +56,7 @@ static void ndisc_router_process_default(Link *link, sd_ndisc_router *rt) {
struct in6_addr gateway;
uint16_t lifetime;
unsigned preference;
+ uint32_t mtu;
usec_t time_now;
int r;
Address *address;
@@ -116,6 +117,12 @@ static void ndisc_router_process_default(Link *link, sd_ndisc_router *rt) {
return;
}
+ r = sd_ndisc_router_get_mtu(rt, &mtu);
+ if (r < 0) {
+ log_link_warning_errno(link, r, "Failed to get default router MTU from RA: %m");
+ return;
+ }
+
r = route_new(&route);
if (r < 0) {
log_link_error_errno(link, r, "Could not allocate route: %m");
@@ -128,6 +135,7 @@ static void ndisc_router_process_default(Link *link, sd_ndisc_router *rt) {
route->pref = preference;
route->gw.in6 = gateway;
route->lifetime = time_now + lifetime * USEC_PER_SEC;
+ route->mtu = mtu;
r = route_configure(route, link, ndisc_netlink_handler);
if (r < 0) {
diff --git a/src/network/networkd-route.c b/src/network/networkd-route.c
index f78e106991..bde26a42d4 100644
--- a/src/network/networkd-route.c
+++ b/src/network/networkd-route.c
@@ -605,6 +605,20 @@ int route_configure(
if (r < 0)
return log_error_errno(r, "Could not append RTA_OIF attribute: %m");
+ r = sd_netlink_message_open_container(req, RTA_METRICS);
+ if (r < 0)
+ return log_error_errno(r, "Could not append RTA_METRICS attribute: %m");
+
+ if (route->mtu > 0) {
+ r = sd_netlink_message_append_u32(req, RTAX_MTU, route->mtu);
+ if (r < 0)
+ return log_error_errno(r, "Could not append RTAX_MTU attribute: %m");
+ }
+
+ r = sd_netlink_message_close_container(req);
+ if (r < 0)
+ return log_error_errno(r, "Could not append RTA_METRICS attribute: %m");
+
r = sd_netlink_call_async(link->manager->rtnl, req, callback, link, 0, NULL);
if (r < 0)
return log_error_errno(r, "Could not send rtnetlink message: %m");
diff --git a/src/network/networkd-route.h b/src/network/networkd-route.h
index d4e4dbac0b..02f0b27675 100644
--- a/src/network/networkd-route.h
+++ b/src/network/networkd-route.h
@@ -37,6 +37,7 @@ struct Route {
unsigned char tos;
uint32_t priority; /* note that ip(8) calls this 'metric' */
uint32_t table;
+ uint32_t mtu;
unsigned char pref;
unsigned flags;