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sctp: introduce sctp_mtu_payload

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When given a MTU, this function calculates how much payload we can carry
on it. Without a MTU, it calculates the amount of header overhead we
have.

So that when we have extra overhead, like the one added for IP options
on SELinux patches, it is easier to handle it.

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 16:58:54 -03:00
committed by David S. Miller
parent c4b2893dae
commit feddd6c1af
3 changed files with 31 additions and 20 deletions
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7
net/sctp/socket.c
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@@ -3234,11 +3234,8 @@ static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned
if (val) {
int min_len, max_len;
min_len = SCTP_DEFAULT_MINSEGMENT - af->net_header_len;
min_len -= af->ip_options_len(sk);
min_len -= sizeof(struct sctphdr) +
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);
if (val < min_len || val > max_len)