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device: add IPv6 sysfs existence check in some ipv6 sysctl functions.

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when the kernel boot parameter ipv6.disable=1 is set, NetworkManager
attempts to read files under /proc/sys/net/ipv6, resulting in numerous
error messages in the debug logs. For example:

NetworkManager[758]: <debug> [1726699000.9384] platform-linux: error reading /proc/sys/net/ipv6/conf/lo/disable_ipv6: Failed to open file "/proc/sys/net/ipv6/conf/lo/disable_ipv6": No such file or directory
NetworkManager[758]: <debug> [1726699000.9400] platform-linux: error reading /proc/sys/net/ipv6/conf/lo/accept_ra: Failed to open file "/proc/sys/net/ipv6/conf/lo/accept_ra": No such file or directory
NetworkManager[758]: <debug> [1726699000.9401] platform-linux: error reading /proc/sys/net/ipv6/conf/lo/disable_ipv6: Failed to open file "/proc/sys/net/ipv6/conf/lo/disable_ipv6": No such file or directory
NetworkManager[758]: <debug> [1726699000.9401] platform-linux: error reading /proc/sys/net/ipv6/conf/lo/hop_limit: Failed to open file "/proc/sys/net/ipv6/conf/lo/hop_limit": No such file or directory
NetworkManager[758]: <debug> [1726699000.9401] platform-linux: error reading /proc/sys/net/ipv6/conf/lo/use_tempaddr: Failed to open file "/proc/sys/net/ipv6/conf/lo/use_tempaddr": No such file or directory
NetworkManager[758]: <debug> [1726699000.9401] platform-linux: error reading /proc/sys/net/ipv6/conf/lo/temp_valid_lft: Failed to open file "/proc/sys/net/ipv6/conf/lo/temp_valid_lft": No such file or directory
NetworkManager[758]: <debug> [1726699000.9401] platform-linux: error reading /proc/sys/net/ipv6/conf/lo/temp_prefered_lft: Failed to open file "/proc/sys/net/ipv6/conf/lo/temp_prefered_lft": No such file or directory
...

This also results unnecessary system calls by attempting to open non-existent sysfs.

This patch adds checks in some ipv6 sysctl functions to verify the existence of /proc/sys/net/ipv6.
While there are still other paths that attempts to open IPv6 sysfs, this
eliminates many reading errors.

https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/2040
This commit is contained in:
Yuki Inoguchi
2024-10-08 14:50:48 -04:00
committed by Lubomir Rintel
parent 6c18fda519
commit 7fc9711c54
1 changed files with 9 additions and 0 deletions
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9
src/core/devices/nm-device.c
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@@ -12817,6 +12817,9 @@ _dev_sysctl_save_ip6_properties(NMDevice *self)
if (!ifname)
return;
if (!g_file_test("/proc/sys/net/ipv6", G_FILE_TEST_IS_DIR))
return;
for (i = 0; i < G_N_ELEMENTS(ip6_properties_to_save); i++) {
value =
nm_platform_sysctl_ip_conf_get(platform, AF_INET6, ifname, ip6_properties_to_save[i]);
@@ -12836,6 +12839,9 @@ _dev_sysctl_restore_ip6_properties(NMDevice *self)
gpointer key;
gpointer value;
if (!g_file_test("/proc/sys/net/ipv6", G_FILE_TEST_IS_DIR))
return;
g_hash_table_iter_init(&iter, priv->ip6_saved_properties);
while (g_hash_table_iter_next(&iter, &key, &value))
nm_device_sysctl_ip_conf_set(self, AF_INET6, key, value);
@@ -16953,6 +16959,9 @@ deactivate_reset_hw_addr(NMDevice *self)
static void
ip6_managed_setup(NMDevice *self)
{
if (!g_file_test("/proc/sys/net/ipv6", G_FILE_TEST_IS_DIR))
return;
_dev_addrgenmode6_set(self, NM_IN6_ADDR_GEN_MODE_NONE);
_dev_sysctl_set_disable_ipv6(self, FALSE);
nm_device_sysctl_ip_conf_set(self, AF_INET6, "accept_ra", "0");