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[posix] add kernel version check for route metric (#12221)

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This commit adds a compile-time check to ensure that
the Linux kernel version is 4.18 or newer for prefix
route metric as `IFA_RT_PRIORITY` attribute for netlink
messages was introduced in v4.18.

`OPENTHREAD_POSIX_CONFIG_INSTALL_OMR_ROUTES_ENABLE` can
be an alternative for prioritizing Off-Mesh-Routable (OMR)
prefixes for older kernels.
This commit is contained in:
Rongli Sun
2025-12-18 08:54:51 -08:00
committed by GitHub
parent dbdb2be2d1
commit e905049eb2
1 changed files with 11 additions and 0 deletions
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src/posix/platform/netif.cpp
+11
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@@ -77,6 +77,17 @@
#include <linux/if_tun.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#if !OPENTHREAD_POSIX_CONFIG_INSTALL_OMR_ROUTES_ENABLE && \
(OPENTHREAD_POSIX_CONFIG_NETIF_LINK_LOCAL_ROUTE_METRIC || OPENTHREAD_POSIX_CONFIG_NETIF_PREFIX_ROUTE_METRIC)
#include <linux/version.h>
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 18, 0)
#error "Cannot set route metric on kernel < 4.18. " \
"Consider using OPENTHREAD_POSIX_CONFIG_INSTALL_OMR_ROUTES_ENABLE "\
"to install OMR routes with higher priority on kernel < 4.18"
#endif // LINUX_VERSION_CODE >= KERNEL_VERSION(4, 18, 0)
#endif
#endif // __linux__
#include <math.h>
#include <net/if.h>