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device: print warning when rp_filter is set to strict with connectivity checking

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This commit is contained in:
Thomas Haller 2019-02-08 16:19:50 +01:00
parent 45f4f573ca
commit 983b430075
1 changed files with 36 additions and 0 deletions
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36
src/devices/nm-device.c
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@ -397,6 +397,8 @@ typedef struct _NMDevicePrivate {
bool ndisc_started:1;
bool device_link_changed_down:1;
bool concheck_rp_filter_checked:1;
/* Generic DHCP stuff */
char * dhcp_anycast_address;
@ -3042,6 +3044,7 @@ concheck_start (NMDevice *self,
static guint64 seq_counter = 0;
NMDevicePrivate *priv;
NMDeviceConnectivityHandle *handle;
const char *ifname;
g_return_val_if_fail (NM_IS_DEVICE (self), NULL);
@ -3064,6 +3067,39 @@ concheck_start (NMDevice *self,
(long long unsigned) handle->seq,
is_periodic ? ", periodic-check" : "");
if ( addr_family == AF_INET
&& !priv->concheck_rp_filter_checked) {
if ((ifname = nm_device_get_ip_iface_from_platform (self))) {
int val, val_all;
val = nm_platform_sysctl_ip_conf_get_int_checked (nm_device_get_platform (self),
AF_INET,
ifname,
"rp_filter",
10, 0, 2, 3);
if (val < 2) {
val_all = nm_platform_sysctl_ip_conf_get_int_checked (nm_device_get_platform (self),
AF_INET,
"all",
"rp_filter",
10, 0, 2, val);
if (val_all > val) {
val = val_all;
ifname = "all";
}
}
if (val == 1) {
_LOGW (LOGD_CONCHECK, "connectivity: \"/proc/sys/net/ipv4/conf/%s/rp_filter\" is set to \"1\". "
"This might break connectivity checking for IPv4 on this device", ifname);
}
}
/* we only check once per device. It's a warning after all. */
priv->concheck_rp_filter_checked = TRUE;
}
handle->c_handle = nm_connectivity_check_start (concheck_get_mgr (self),
handle->addr_family,
nm_device_get_ip_ifindex (self),