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author | Antony Antony <antony.antony@secunet.com> | 2021-12-22 14:11:18 +0100 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-01-27 10:54:18 +0100 |
commit | a0b13335a342c9083640ba0ea6fe7c8d8076cae7 (patch) | |
tree | 26c03d460f89e910ba551c5a09a5613f3f6baa0e /include | |
parent | 0b7beb2fea8f16f59f818336f162014e7be6e835 (diff) |
xfrm: rate limit SA mapping change message to user space
[ Upstream commit 4e484b3e969b52effd95c17f7a86f39208b2ccf4 ]
Kernel generates mapping change message, XFRM_MSG_MAPPING,
when a source port chage is detected on a input state with UDP
encapsulation set. Kernel generates a message for each IPsec packet
with new source port. For a high speed flow per packet mapping change
message can be excessive, and can overload the user space listener.
Introduce rate limiting for XFRM_MSG_MAPPING message to the user space.
The rate limiting is configurable via netlink, when adding a new SA or
updating it. Use the new attribute XFRMA_MTIMER_THRESH in seconds.
v1->v2 change:
update xfrm_sa_len()
v2->v3 changes:
use u32 insted unsigned long to reduce size of struct xfrm_state
fix xfrm_ompat size Reported-by: kernel test robot <lkp@intel.com>
accept XFRM_MSG_MAPPING only when XFRMA_ENCAP is present
Co-developed-by: Thomas Egerer <thomas.egerer@secunet.com>
Signed-off-by: Thomas Egerer <thomas.egerer@secunet.com>
Signed-off-by: Antony Antony <antony.antony@secunet.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include')
-rw-r--r-- | include/net/xfrm.h | 5 | ||||
-rw-r--r-- | include/uapi/linux/xfrm.h | 1 |
2 files changed, 6 insertions, 0 deletions
diff --git a/include/net/xfrm.h b/include/net/xfrm.h index 6232a5f048bd..337d29875e51 100644 --- a/include/net/xfrm.h +++ b/include/net/xfrm.h @@ -193,6 +193,11 @@ struct xfrm_state { struct xfrm_algo_aead *aead; const char *geniv; + /* mapping change rate limiting */ + __be16 new_mapping_sport; + u32 new_mapping; /* seconds */ + u32 mapping_maxage; /* seconds for input SA */ + /* Data for encapsulator */ struct xfrm_encap_tmpl *encap; struct sock __rcu *encap_sk; diff --git a/include/uapi/linux/xfrm.h b/include/uapi/linux/xfrm.h index ffc6a5391bb7..2290c98b47cf 100644 --- a/include/uapi/linux/xfrm.h +++ b/include/uapi/linux/xfrm.h @@ -308,6 +308,7 @@ enum xfrm_attr_type_t { XFRMA_SET_MARK, /* __u32 */ XFRMA_SET_MARK_MASK, /* __u32 */ XFRMA_IF_ID, /* __u32 */ + XFRMA_MTIMER_THRESH, /* __u32 in seconds for input SA */ __XFRMA_MAX #define XFRMA_OUTPUT_MARK XFRMA_SET_MARK /* Compatibility */ |