From 7307e4fa4d295f6dc017fe4b19467c486a1275d7 Mon Sep 17 00:00:00 2001 From: Xin Long Date: Tue, 22 Jun 2021 14:04:56 -0400 Subject: sctp: enable PLPMTUD when the transport is ready sctp_transport_pl_reset() is called whenever any of these 3 members in transport is changed: - probe_interval - param_flags & SPP_PMTUD_ENABLE - state == ACTIVE If all are true, start the PLPMTUD when it's not yet started. If any of these is false, stop the PLPMTUD when it's already running. sctp_transport_pl_update() is called when the transport dst has changed. It will restart the PLPMTUD probe. Again, the pathmtu won't change but use the dst's mtu until the Search phase is done. Note that after using PLPMTUD, the pathmtu is only initialized with the dst mtu when the transport dst changes. At other time it is updated by pl.pmtu. So sctp_transport_pmtu_check() will be called only when PLPMTUD is disabled in sctp_packet_config(). After this patch, the PLPMTUD feature from RFC8899 will be activated and can be used by users. Signed-off-by: Xin Long Acked-by: Marcelo Ricardo Leitner Signed-off-by: David S. Miller --- net/sctp/socket.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'net/sctp/socket.c') diff --git a/net/sctp/socket.c b/net/sctp/socket.c index aba576f53458..e64e01f61b11 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -2496,6 +2496,7 @@ static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params, sctp_transport_pmtu(trans, sctp_opt2sk(sp)); sctp_assoc_sync_pmtu(asoc); } + sctp_transport_pl_reset(trans); } else if (asoc) { asoc->param_flags = (asoc->param_flags & ~SPP_PMTUD) | pmtud_change; @@ -4506,6 +4507,7 @@ static int sctp_setsockopt_probe_interval(struct sock *sk, return -EINVAL; t->probe_interval = msecs_to_jiffies(probe_interval); + sctp_transport_pl_reset(t); return 0; } @@ -4522,8 +4524,10 @@ static int sctp_setsockopt_probe_interval(struct sock *sk, * each transport. */ if (asoc) { - list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) + list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) { t->probe_interval = msecs_to_jiffies(probe_interval); + sctp_transport_pl_reset(t); + } asoc->probe_interval = msecs_to_jiffies(probe_interval); return 0; -- cgit v1.2.3