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bpf: Add workaround for ubuntu 20.04

This commit is contained in:
Tatsuhiro Tsujikawa 2021-09-16 20:20:02 +09:00
parent 8f9744c07b
commit f3b9cd8404
1 changed files with 10 additions and 0 deletions
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10
bpf/reuseport_kern.c
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@ -24,6 +24,7 @@
*/
#include <linux/udp.h>
#include <linux/bpf.h>
#include <linux/version.h>
#include <bpf/bpf_helpers.h>
@ -240,7 +241,16 @@ static void InvSubBytes(state_t *state) {
__u8 i, j;
for (i = 0; i < 4; ++i) {
for (j = 0; j < 4; ++j) {
#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 10, 0)
/* Ubuntu 20.04 LTS kernel 5.4.0 needs this workaround otherwise
"math between map_value pointer and register with unbounded
min value is not allowed". 5.10.0 is a kernel version that
works but it might not be a minimum version. */
__u8 k = (*state)[j][i];
(*state)[j][i] = k ? getSBoxInvert(k) : getSBoxInvert(0);
#else /* !(LINUX_VERSION_CDOE < KERNEL_VERSION(5, 10, 0)) */
(*state)[j][i] = getSBoxInvert((*state)[j][i]);
#endif /* !(LINUX_VERSION_CDOE < KERNEL_VERSION(5, 10, 0)) */
}
}
}