I'm not sure whether this was done deliberately, but the
sctp_v4_create_accept_sk doesn't set the newinet->pmtudisc
like it is done in both cases (ipv4 and v6) for tcp sockets
and for sctp over ipv6 socket.
This loss is painless, I suppose, since the whole socket is
zeroed by default and thus this field is automatically set
to IP_PMTUDISC_DONT.
Restore this setting logic for sctp over ipv4 socket.
Signed-off-by: Pavel Emelyanov <xemul@xxxxxxxxxx>
---
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index a6e0818..b05c739 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -626,6 +626,11 @@ static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
newinet->mc_index = 0;
newinet->mc_list = NULL;
+ if (ipv4_config.no_pmtu_disc)
+ newinet->pmtudisc = IP_PMTUDISC_DONT;
+ else
+ newinet->pmtudisc = IP_PMTUDISC_WANT;
+
sk_refcnt_debug_inc(newsk);
if (newsk->sk_prot->init(newsk)) {
--
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