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| author | Xin Long <lucien.xin@gmail.com> | 2021-06-22 20:04:53 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-06-22 20:28:52 +0200 |
| commit | 1dc68c194571acc4027de5f8378227d0c0ff7e13 (patch) | |
| tree | 502a1b621e23740e42d571aa3c65c336dc144194 /include/net/sctp/structs.h | |
| parent | sctp: do the basic send and recv for PLPMTUD probe (diff) | |
| download | linux-1dc68c194571acc4027de5f8378227d0c0ff7e13.tar.xz linux-1dc68c194571acc4027de5f8378227d0c0ff7e13.zip | |
sctp: do state transition when PROBE_COUNT == MAX_PROBES on HB send path
The state transition is described in rfc8899#section-5.2,
PROBE_COUNT == MAX_PROBES means the probe fails for MAX times, and the
state transition includes:
- Base -> Error, occurs when BASE_PLPMTU Confirmation Fails,
pl.pmtu is set to SCTP_MIN_PLPMTU,
probe_size is still SCTP_BASE_PLPMTU;
- Search -> Base, occurs when Black Hole Detected,
pl.pmtu is set to SCTP_BASE_PLPMTU,
probe_size is set back to SCTP_BASE_PLPMTU;
- Search Complete -> Base, occurs when Black Hole Detected
pl.pmtu is set to SCTP_BASE_PLPMTU,
probe_size is set back to SCTP_BASE_PLPMTU;
Note a black hole is encountered when a sender is unaware that packets
are not being delivered to the destination endpoint. So it includes the
probe failures with equal probe_size to pl.pmtu, and definitely not
include that with greater probe_size than pl.pmtu. The later one is the
normal probe failure where probe_size should decrease back to pl.pmtu
and pl.probe_high is set. pl.probe_high would be used on HB ACK recv
path in the next patch.
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/sctp/structs.h')
| -rw-r--r-- | include/net/sctp/structs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h index f7b056f5af37..31165720b28a 100644 --- a/include/net/sctp/structs.h +++ b/include/net/sctp/structs.h @@ -1023,6 +1023,7 @@ bool sctp_transport_update_pmtu(struct sctp_transport *t, u32 pmtu); void sctp_transport_immediate_rtx(struct sctp_transport *); void sctp_transport_dst_release(struct sctp_transport *t); void sctp_transport_dst_confirm(struct sctp_transport *t); +void sctp_transport_pl_send(struct sctp_transport *t); /* This is the structure we use to queue packets as they come into |