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| author |   Jason A. Donenfeld <Jason@zx2c4.com> | 2018-08-01 19:09:18 +0200 |
|---|---|---|
| committer | Jason A. Donenfeld <Jason@zx2c4.com> | 2018-08-02 07:40:26 +0200 |
| commit | 2b4023d7cadae4a712de768196171bafc2af24b7 (patch) | |
| tree | e61235dc1e757050192e14dbe1f21d64bec8d18b /src/compat/compat.h | |
| parent | queueing: document double-adding and reference conditions (diff) | |
| download | wireguard-linux-compat-2b4023d7cadae4a712de768196171bafc2af24b7.tar.xz wireguard-linux-compat-2b4023d7cadae4a712de768196171bafc2af24b7.zip | |
queueing: ensure strictly ordered loads and stores
We don't want a consumer to read plaintext when it's supposed to be
reading ciphertext, which means we need to synchronize across cores.
Suggested-by: Jann Horn <jann@thejh.net>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Diffstat (limited to 'src/compat/compat.h')
| -rw-r--r-- | src/compat/compat.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/src/compat/compat.h b/src/compat/compat.h index 7943ab8..5b3075b 100644 --- a/src/compat/compat.h +++ b/src/compat/compat.h @@ -610,6 +610,34 @@ static inline void *skb_put_data(struct sk_buff *skb, const void *data, unsigned #define NAPI_STATE_NO_BUSY_POLL NAPI_STATE_SCHED #endif +#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 14, 0) +#ifndef smp_store_release +#define smp_store_release(p, v) \ +do { \ + smp_mb(); \ + ACCESS_ONCE(*p) = (v); \ +} while (0) +#endif +#ifndef smp_load_acquire +#define smp_load_acquire(p) \ +({ \ + typeof(*p) ___p1 = ACCESS_ONCE(*p); \ + smp_mb(); \ + ___p1; \ +}) +#endif +#endif + +#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0) +#include <linux/atomic.h> +#ifndef atomic_read_acquire +#define atomic_read_acquire(v) smp_load_acquire(&(v)->counter) +#endif +#ifndef atomic_set_release +#define atomic_set_release(v, i) smp_store_release(&(v)->counter, (i)) +#endif +#endif + /* https://lkml.kernel.org/r/20170624021727.17835-1-Jason@zx2c4.com */ #if IS_ENABLED(CONFIG_NF_CONNTRACK) #include <linux/ip.h> |