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sctp: implement validate_data for sctp_stream_interleave

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validate_data is added as a member of sctp_stream_interleave, used
to validate ssn/chunk type for data or mid (message id)/chunk type
for idata, called in sctp_eat_data.

If this check fails, an abort packet will be sent, as said in
section 2.2.3 of RFC8260.

It also adds the process for idata in rx path. As Marcelo pointed
out, there's no need to add event table for idata, but just share
chunk_event_table with data's. It would drop data chunk for idata
and drop idata chunk for data by calling validate_data in
sctp_eat_data.

As last patch did, it also replaces sizeof(struct sctp_data_chunk)
with sctp_datachk_len for rx path.

After this patch, the idata can be accepted and delivered to ulp
layer.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long
2017-12-08 21:04:03 +08:00
committed by David S. Miller
parent 668c9beb90
commit 9d4ceaf154
6 changed files with 62 additions and 14 deletions
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6
include/net/sctp/structs.h
View File

@@ -1382,7 +1382,11 @@ struct sctp_stream_out {
};
struct sctp_stream_in {
__u16 ssn;
union {
__u32 mid;
__u16 ssn;
};
__u32 fsn;
};
struct sctp_stream {