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Merge pull request #34736 from yuwata/network-mtu

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network: wait for IPv6 MTU being synced to link MTU
This commit is contained in:
Yu Watanabe 2024-10-15 10:54:58 +09:00 committed by GitHub
commit 11a8cb490f
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8 changed files with 141 additions and 24 deletions
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27
src/basic/sysctl-util.c
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@ -10,6 +10,7 @@
#include "fileio.h"
#include "log.h"
#include "macro.h"
#include "parse-util.h"
#include "path-util.h"
#include "socket-util.h"
#include "string-util.h"
@ -193,3 +194,29 @@ int sysctl_read_ip_property(int af, const char *ifname, const char *property, ch
return sysctl_read(p, ret);
}
int sysctl_read_ip_property_int(int af, const char *ifname, const char *property, int *ret) {
_cleanup_free_ char *s = NULL;
int r;
assert(ret);
r = sysctl_read_ip_property(af, ifname, property, &s);
if (r < 0)
return r;
return safe_atoi(s, ret);
}
int sysctl_read_ip_property_uint32(int af, const char *ifname, const char *property, uint32_t *ret) {
_cleanup_free_ char *s = NULL;
int r;
assert(ret);
r = sysctl_read_ip_property(af, ifname, property, &s);
if (r < 0)
return r;
return safe_atou32(s, ret);
}

2
src/basic/sysctl-util.h
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@ -17,6 +17,8 @@ static inline int sysctl_write(const char *property, const char *value) {
}
int sysctl_read_ip_property(int af, const char *ifname, const char *property, char **ret);
int sysctl_read_ip_property_int(int af, const char *ifname, const char *property, int *ret);
int sysctl_read_ip_property_uint32(int af, const char *ifname, const char *property, uint32_t *ret);
int sysctl_write_ip_property(int af, const char *ifname, const char *property, const char *value, Hashmap **shadow);
static inline int sysctl_write_ip_property_boolean(int af, const char *ifname, const char *property, bool value, Hashmap **shadow) {
return sysctl_write_ip_property(af, ifname, property, one_zero(value), shadow);

14
src/network/networkd-link.c
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@ -288,6 +288,7 @@ static Link *link_free(Link *link) {
network_unref(link->network);
sd_event_source_disable_unref(link->carrier_lost_timer);
sd_event_source_disable_unref(link->ipv6_mtu_wait_synced_event_source);
return mfree(link);
}
@ -1869,8 +1870,6 @@ static int link_carrier_lost(Link *link) {
}
static int link_admin_state_up(Link *link) {
int r;
assert(link);
/* This is called every time an interface admin state changes to up;
@ -1886,9 +1885,7 @@ static int link_admin_state_up(Link *link) {
/* We set the ipv6 mtu after the device mtu, but the kernel resets
* ipv6 mtu on NETDEV_UP, so we need to reset it. */
r = link_set_ipv6_mtu(link, LOG_INFO);
if (r < 0)
log_link_warning_errno(link, r, "Cannot set IPv6 MTU, ignoring: %m");
(void) link_set_ipv6_mtu(link, LOG_INFO);
return 0;
}
@ -2439,12 +2436,9 @@ static int link_update_mtu(Link *link, sd_netlink_message *message) {
link->mtu = mtu;
if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
/* The kernel resets IPv6 MTU after changing device MTU. So, we need to re-set IPv6 MTU again. */
r = link_set_ipv6_mtu(link, LOG_INFO);
if (r < 0)
log_link_warning_errno(link, r, "Failed to set IPv6 MTU, ignoring: %m");
}
(void) link_set_ipv6_mtu_async(link);
if (link->dhcp_client) {
r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);

3
src/network/networkd-link.h
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@ -74,6 +74,9 @@ typedef struct Link {
sd_device *dev;
char *driver;
sd_event_source *ipv6_mtu_wait_synced_event_source;
unsigned ipv6_mtu_wait_trial_count;
/* bridge vlan */
uint16_t bridge_vlan_pvid;
bool bridge_vlan_pvid_is_untagged;

4
src/network/networkd-ndisc.c
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@ -1083,9 +1083,7 @@ static int ndisc_router_process_mtu(Link *link, sd_ndisc_router *rt) {
link->ndisc_mtu = mtu;
r = link_set_ipv6_mtu(link, LOG_DEBUG);
if (r < 0)
log_link_warning_errno(link, r, "Failed to apply IPv6 MTU (%"PRIu32"), ignoring: %m", mtu);
(void) link_set_ipv6_mtu(link, LOG_DEBUG);
return 0;
}

17
src/network/networkd-route-util.c
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@ -16,23 +16,26 @@
#include "strv.h"
#include "sysctl-util.h"
#define ROUTES_DEFAULT_MAX_PER_FAMILY 4096U
#define ROUTES_DEFAULT_MAX_PER_FAMILY 4096
unsigned routes_max(void) {
static thread_local unsigned cached = 0;
_cleanup_free_ char *s4 = NULL, *s6 = NULL;
unsigned val4 = ROUTES_DEFAULT_MAX_PER_FAMILY, val6 = ROUTES_DEFAULT_MAX_PER_FAMILY;
int val4 = ROUTES_DEFAULT_MAX_PER_FAMILY, val6 = ROUTES_DEFAULT_MAX_PER_FAMILY;
if (cached > 0)
return cached;
if (sysctl_read_ip_property(AF_INET, NULL, "route/max_size", &s4) >= 0)
if (safe_atou(s4, &val4) >= 0 && val4 == 2147483647U)
/* The kernel internally stores these maximum size in int. */
if (sysctl_read_ip_property_int(AF_INET, /* ifname = */ NULL, "route/max_size", &val4) >= 0)
if (val4 == INT_MAX)
/* This is the default "no limit" value in the kernel */
val4 = ROUTES_DEFAULT_MAX_PER_FAMILY;
if (sysctl_read_ip_property(AF_INET6, NULL, "route/max_size", &s6) >= 0)
(void) safe_atou(s6, &val6);
if (sysctl_read_ip_property_int(AF_INET6, /* ifname = */ NULL, "route/max_size", &val6) >= 0)
if (val6 == INT_MAX)
/* This is the default "no limit" value in the kernel */
val6 = ROUTES_DEFAULT_MAX_PER_FAMILY;
cached = MAX(ROUTES_DEFAULT_MAX_PER_FAMILY, val4) +
MAX(ROUTES_DEFAULT_MAX_PER_FAMILY, val6);

97
src/network/networkd-sysctl.c
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@ -8,6 +8,7 @@
#include "af-list.h"
#include "cgroup-util.h"
#include "event-util.h"
#include "fd-util.h"
#include "format-util.h"
#include "missing_network.h"
@ -503,6 +504,7 @@ static int link_set_ipv6_proxy_ndp(Link *link) {
int link_set_ipv6_mtu(Link *link, int log_level) {
uint32_t mtu = 0;
int r;
assert(link);
assert(link->manager);
@ -510,6 +512,14 @@ int link_set_ipv6_mtu(Link *link, int log_level) {
if (!link_is_configured_for_family(link, AF_INET6))
return 0;
if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
return 0;
if (sd_event_source_get_enabled(link->ipv6_mtu_wait_synced_event_source, /* ret = */ NULL) > 0) {
log_link_debug(link, "Waiting for IPv6 MTU is synced to link MTU, delaying to set IPv6 MTU.");
return 0;
}
assert(link->network);
if (link->network->ndisc_use_mtu)
@ -526,7 +536,88 @@ int link_set_ipv6_mtu(Link *link, int log_level) {
mtu = link->mtu;
}
return sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", mtu, manager_get_sysctl_shadow(link->manager));
r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", mtu, manager_get_sysctl_shadow(link->manager));
if (r < 0)
return log_link_warning_errno(link, r, "Failed to set IPv6 MTU to %"PRIu32": %m", mtu);
return 0;
}
static int ipv6_mtu_wait_synced_handler(sd_event_source *s, uint64_t usec, void *userdata);
static int link_set_ipv6_mtu_async_impl(Link *link) {
uint32_t current_mtu;
int r;
assert(link);
/* When the link MTU is updated, it seems that the kernel IPv6 MTU of the interface is asynchronously
* reset to the link MTU. Hence, we need to check if it is already reset, and wait for a while if not. */
if (++link->ipv6_mtu_wait_trial_count >= 10) {
log_link_debug(link, "Timed out waiting for IPv6 MTU being synced to link MTU, proceeding anyway.");
r = link_set_ipv6_mtu(link, LOG_INFO);
if (r < 0)
return r;
return 1; /* done */
}
/* Check if IPv6 MTU is synced. */
r = sysctl_read_ip_property_uint32(AF_INET6, link->ifname, "mtu", &current_mtu);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to read IPv6 MTU: %m");
if (current_mtu == link->mtu) {
/* Already synced. Update IPv6 MTU now. */
r = link_set_ipv6_mtu(link, LOG_INFO);
if (r < 0)
return r;
return 1; /* done */
}
/* If not, set up a timer event source. */
r = event_reset_time_relative(
link->manager->event, &link->ipv6_mtu_wait_synced_event_source,
CLOCK_BOOTTIME, 100 * USEC_PER_MSEC, 0,
ipv6_mtu_wait_synced_handler, link,
/* priority = */ 0, "ipv6-mtu-wait-synced", /* force = */ true);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to configure timer event source for waiting for IPv6 MTU being synced: %m");
/* Check again. */
r = sysctl_read_ip_property_uint32(AF_INET6, link->ifname, "mtu", &current_mtu);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to read IPv6 MTU: %m");
if (current_mtu == link->mtu) {
/* Synced while setting up the timer event source. Disable it and update IPv6 MTU now. */
r = sd_event_source_set_enabled(link->ipv6_mtu_wait_synced_event_source, SD_EVENT_OFF);
if (r < 0)
log_link_debug_errno(link, r, "Failed to disable timer event source for IPv6 MTU, ignoring: %m");
r = link_set_ipv6_mtu(link, LOG_INFO);
if (r < 0)
return r;
return 1; /* done */
}
log_link_debug(link, "IPv6 MTU is not synced to the link MTU after it is changed. Waiting for a while.");
return 0; /* waiting */
}
static int ipv6_mtu_wait_synced_handler(sd_event_source *s, uint64_t usec, void *userdata) {
(void) link_set_ipv6_mtu_async_impl(ASSERT_PTR(userdata));
return 0;
}
int link_set_ipv6_mtu_async(Link *link) {
assert(link);
link->ipv6_mtu_wait_trial_count = 0;
return link_set_ipv6_mtu_async_impl(link);
}
static int link_set_ipv4_accept_local(Link *link) {
@ -616,9 +707,7 @@ int link_set_sysctl(Link *link) {
if (r < 0)
log_link_warning_errno(link, r, "Cannot set IPv6 proxy NDP, ignoring: %m");
r = link_set_ipv6_mtu(link, LOG_INFO);
if (r < 0)
log_link_warning_errno(link, r, "Cannot set IPv6 MTU, ignoring: %m");
(void) link_set_ipv6_mtu(link, LOG_INFO);
r = link_set_ipv6ll_stable_secret(link);
if (r < 0)

1
src/network/networkd-sysctl.h
View File

@ -42,6 +42,7 @@ void manager_set_sysctl(Manager *manager);
int link_get_ip_forwarding(Link *link, int family);
int link_set_sysctl(Link *link);
int link_set_ipv6_mtu(Link *link, int log_level);
int link_set_ipv6_mtu_async(Link *link);
const char* ipv6_privacy_extensions_to_string(IPv6PrivacyExtensions i) _const_;
IPv6PrivacyExtensions ipv6_privacy_extensions_from_string(const char *s) _pure_;