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mptcp: add mptcp reset option support

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The MPTCP reset option allows to carry a mptcp-specific error code that
provides more information on the nature of a connection reset.

Reset option data received gets stored in the subflow context so it can
be sent to userspace via the 'subflow closed' netlink event.

When a subflow is closed, the desired error code that should be sent to
the peer is also placed in the subflow context structure.

If a reset is sent before subflow establishment could complete, e.g. on
HMAC failure during an MP_JOIN operation, the mptcp skb extension is
used to store the reset information.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2021-04-01 16:19:44 -07:00 • committed by David S. Miller
parent 781bf13d4f
commit dc87efdb1a
9 changed files with 180 additions and 19 deletions
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11
include/uapi/linux/mptcp.h
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@ -174,10 +174,21 @@ enum mptcp_event_attr {
MPTCP_ATTR_FLAGS, /* u16 */
MPTCP_ATTR_TIMEOUT, /* u32 */
MPTCP_ATTR_IF_IDX, /* s32 */
MPTCP_ATTR_RESET_REASON,/* u32 */
MPTCP_ATTR_RESET_FLAGS, /* u32 */
__MPTCP_ATTR_AFTER_LAST
};
#define MPTCP_ATTR_MAX (__MPTCP_ATTR_AFTER_LAST - 1)
/* MPTCP Reset reason codes, rfc8684 */
#define MPTCP_RST_EUNSPEC 0
#define MPTCP_RST_EMPTCP 1
#define MPTCP_RST_ERESOURCE 2
#define MPTCP_RST_EPROHIBIT 3
#define MPTCP_RST_EWQ2BIG 4
#define MPTCP_RST_EBADPERF 5
#define MPTCP_RST_EMIDDLEBOX 6
#endif /* _UAPI_MPTCP_H */