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sctp: consider idata chunks when setting SCTP_MAXSEG 

When setting SCTP_MAXSEG sock option, it should consider which kind of
data chunk is being used if the asoc is already available, so that the
limit better reflect reality.

Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Marcelo Ricardo Leitner 2018-04-26 16:59:01 -03:00 committed by David S. Miller
parent 63d01330aa
commit 439ef0309c
1 changed files with 6 additions and 3 deletions
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9
net/sctp/socket.c
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@ -3233,18 +3233,21 @@ static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned
return -EINVAL;
}
asoc = sctp_id2assoc(sk, params.assoc_id);
if (val) {
int min_len, max_len;
__u16 datasize = asoc ? sctp_datachk_len(&asoc->stream) :
sizeof(struct sctp_data_chunk);
min_len = sctp_mtu_payload(sp, SCTP_DEFAULT_MINSEGMENT,
sizeof(struct sctp_data_chunk));
max_len = SCTP_MAX_CHUNK_LEN - sizeof(struct sctp_data_chunk);
datasize);
max_len = SCTP_MAX_CHUNK_LEN - datasize;
if (val < min_len || val > max_len)
return -EINVAL;
}
asoc = sctp_id2assoc(sk, params.assoc_id);
if (asoc) {
if (val == 0) {
val = asoc->pathmtu - af->net_header_len;