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network/route: use sysctl_read_ip_property_int() for reading route/max_size

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This commit is contained in:
Yu Watanabe
2024-10-15 06:52:19 +09:00
parent d56d07fc1e
commit ea684ccb6d
1 changed files with 10 additions and 7 deletions
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src/network/networkd-route-util.c
+10 -7
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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);