Re: [PATCH net] sctp: check for dst and pathmtu update in sctp_packet_config

[David Miller <davem@davemloft.net>]

From: Xin Long <lucien.xin@gmail.com>
Date: Sat,  1 Apr 2017 17:15:59 +0800

> This patch is to move sctp_transport_dst_check into sctp_packet_config
> from sctp_packet_transmit and add pathmtu check in sctp_packet_config.
> 
> With this fix, sctp can update dst or pathmtu before appending chunks,
> which can void dropping packets in sctp_packet_transmit when dst is
> obsolete or dst's mtu is changed.
> 
> This patch is also to improve some other codes in sctp_packet_config.
> It updates packet max_size with gso_max_size, checks for dst and
> pathmtu, and appends ecne chunk only when packet is empty and asoc
> is not NULL.
> 
> It makes sctp flush work better, as we only need to set up them once
> for one flush schedule. It's also safe, since asoc is NULL only when
> the packet is created by sctp_ootb_pkt_new in which it just gets the
> new dst, no need to do more things for it other than set packet with
> transport's pathmtu.
> 
> Signed-off-by: Xin Long <lucien.xin@gmail.com>

Applied, thanks Xin.