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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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25
net/sctp/output.c
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@@ -90,8 +90,8 @@ void sctp_packet_config(struct sctp_packet *packet, __u32 vtag,
{
struct sctp_transport *tp = packet->transport;
struct sctp_association *asoc = tp->asoc;
struct sctp_sock *sp = NULL;
struct sock *sk;
size_t overhead = sizeof(struct ipv6hdr) + sizeof(struct sctphdr);
pr_debug("%s: packet:%p vtag:0x%x\n", __func__, packet, vtag);
packet->vtag = vtag;
@@ -102,25 +102,20 @@ void sctp_packet_config(struct sctp_packet *packet, __u32 vtag,
/* set packet max_size with pathmtu, then calculate overhead */
packet->max_size = tp->pathmtu;
if (asoc) {
struct sctp_sock *sp = sctp_sk(asoc->base.sk);
struct sctp_af *af = sp->pf->af;
overhead = af->net_header_len +
af->ip_options_len(asoc->base.sk);
overhead += sizeof(struct sctphdr);
packet->overhead = overhead;
packet->size = overhead;
} else {
packet->overhead = overhead;
packet->size = overhead;
return;
if (asoc) {
sk = asoc->base.sk;
sp = sctp_sk(sk);
}
packet->overhead = sctp_mtu_payload(sp, 0, 0);
packet->size = packet->overhead;
if (!asoc)
return;
/* update dst or transport pathmtu if in need */
sk = asoc->base.sk;
if (!sctp_transport_dst_check(tp)) {
sctp_transport_route(tp, NULL, sctp_sk(sk));
sctp_transport_route(tp, NULL, sp);
if (asoc->param_flags & SPP_PMTUD_ENABLE)
sctp_assoc_sync_pmtu(asoc);
} else if (!sctp_transport_pmtu_check(tp)) {