From: Dmitry Eremin-Solenikov <dmitry.ereminsoleni...@linaro.org> Current code has a race condition between inbound traffic and creation of new SA. It is possible for inbound traffic to trigger partially created SA using SA_LOOKUP option (or INLINE mode). Add separate (RESERVED) stage for SA which is in process of being created.
Fixes: https://bugs.linaro.org/show_bug.cgi?id=3594 Signed-off-by: Dmitry Eremin-Solenikov <dmitry.ereminsoleni...@linaro.org> --- /** Email created from pull request 427 (lumag:ipsec-fix-sad) ** https://github.com/Linaro/odp/pull/427 ** Patch: https://github.com/Linaro/odp/pull/427.patch ** Base sha: 27480d82bd93a881ae683a3c314c11042a68ce29 ** Merge commit sha: 67c9dbf28c41ea7a53782ba841276b03f154c4ef **/ platform/linux-generic/odp_ipsec_sad.c | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-) diff --git a/platform/linux-generic/odp_ipsec_sad.c b/platform/linux-generic/odp_ipsec_sad.c index 845a73dea..bb984db38 100644 --- a/platform/linux-generic/odp_ipsec_sad.c +++ b/platform/linux-generic/odp_ipsec_sad.c @@ -17,7 +17,8 @@ #include <string.h> #define IPSEC_SA_STATE_DISABLE 0x40000000 -#define IPSEC_SA_STATE_FREE 0xc0000000 /* This includes disable !!! */ +#define IPSEC_SA_STATE_FREE 0xc0000000 +#define IPSEC_SA_STATE_RESERVED 0x80000000 typedef struct ipsec_sa_table_t { ipsec_sa_t ipsec_sa[ODP_CONFIG_IPSEC_SAS]; @@ -108,7 +109,8 @@ static ipsec_sa_t *ipsec_sa_reserve(void) ipsec_sa = ipsec_sa_entry(i); - if (odp_atomic_cas_acq_u32(&ipsec_sa->state, &state, 0)) + if (odp_atomic_cas_acq_u32(&ipsec_sa->state, &state, + IPSEC_SA_STATE_RESERVED)) return ipsec_sa; } @@ -120,6 +122,12 @@ static void ipsec_sa_release(ipsec_sa_t *ipsec_sa) odp_atomic_store_rel_u32(&ipsec_sa->state, IPSEC_SA_STATE_FREE); } +/* Mark reserved SA as available now */ +static void ipsec_sa_publish(ipsec_sa_t *ipsec_sa) +{ + odp_atomic_store_rel_u32(&ipsec_sa->state, 0); +} + static int ipsec_sa_lock(ipsec_sa_t *ipsec_sa) { int cas = 0; @@ -128,9 +136,11 @@ static int ipsec_sa_lock(ipsec_sa_t *ipsec_sa) while (0 == cas) { /* * This can be called from lookup path, so we really need this - * check + * check. Thanks to the way flags are defined we actually test + * that the SA is not DISABLED, FREE or RESERVED using just one + * condition. */ - if (state & IPSEC_SA_STATE_DISABLE) + if (state & IPSEC_SA_STATE_FREE) return -1; cas = odp_atomic_cas_acq_u32(&ipsec_sa->state, &state, @@ -438,6 +448,8 @@ odp_ipsec_sa_t odp_ipsec_sa_create(const odp_ipsec_sa_param_t *param) &ses_create_rc)) goto error; + ipsec_sa_publish(ipsec_sa); + return ipsec_sa->ipsec_sa_hdl; error:
