diff options
Diffstat (limited to 'src/compat/compat.h')
| -rw-r--r-- | src/compat/compat.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/compat/compat.h b/src/compat/compat.h index 141cad7..4e6010f 100644 --- a/src/compat/compat.h +++ b/src/compat/compat.h @@ -171,6 +171,25 @@ static inline void skb_reset_tc(struct sk_buff *skb) } #endif +#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 11, 0) +#include <linux/siphash.h> +static inline u32 get_random_u32(void) +{ + static siphash_key_t key; + static u32 counter = 0; +#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 4, 0) + static bool has_seeded = false; + if (unlikely(!has_seeded)) { + get_random_bytes(&key, sizeof(key)); + has_seeded = true; + } +#else + get_random_once(&key, sizeof(key)); +#endif + return siphash_2u32(counter++, get_random_int(), &key); +} +#endif + /* https://lkml.org/lkml/2015/6/12/415 */ #include <linux/netdevice.h> static inline struct net_device *netdev_pub(void *dev) |