Re: [PATCH net 3/3] sctp: do not abandon the other frags in unsent outq if one msg has outstanding frags

[Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>]

On Sat, Nov 25, 2017 at 09:18:36PM +0800, Xin Long wrote:
> Now for the abandoned chunks in unsent outq, it would just free the chunks.
> Because no tsn is assigned to them yet, there's no need to send fwd tsn to
> peer, unlike for the abandoned chunks in sent outq.
> 
> The problem is when parts of the msg have been sent and the other frags
> are still in unsent outq, if they are abandoned/dropped, the peer would
> never get this msg reassembled.
> 
> So these frags in unsent outq can't be dropped if this msg already has
> outstanding frags.
> 
> This patch does the check in sctp_chunk_abandoned and
> sctp_prsctp_prune_unsent.
> 
> Signed-off-by: Xin Long <lucien.xin@gmail.com>

Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>

> ---
>  net/sctp/chunk.c    | 4 ++++
>  net/sctp/outqueue.c | 3 ++-
>  2 files changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/net/sctp/chunk.c b/net/sctp/chunk.c
> index 9213805..7f8baa4 100644
> --- a/net/sctp/chunk.c
> +++ b/net/sctp/chunk.c
> @@ -308,6 +308,10 @@ int sctp_chunk_abandoned(struct sctp_chunk *chunk)
>  	if (chunk->msg->abandoned)
>  		return 1;
>  
> +	if (!chunk->has_tsn &&
> +	    !(chunk->chunk_hdr->flags & SCTP_DATA_FIRST_FRAG))
> +		return 0;
> +
>  	if (SCTP_PR_TTL_ENABLED(chunk->sinfo.sinfo_flags) &&
>  	    time_after(jiffies, chunk->msg->expires_at)) {
>  		struct sctp_stream_out *streamout =
> diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
> index 4ab164b..7d67fee 100644
> --- a/net/sctp/outqueue.c
> +++ b/net/sctp/outqueue.c
> @@ -407,7 +407,8 @@ static int sctp_prsctp_prune_unsent(struct sctp_association *asoc,
>  
>  	list_for_each_entry_safe(chk, temp, &q->out_chunk_list, list) {
>  		if (!chk->msg->abandoned &&
> -		    (!SCTP_PR_PRIO_ENABLED(chk->sinfo.sinfo_flags) ||
> +		    (!(chk->chunk_hdr->flags & SCTP_DATA_FIRST_FRAG) ||
> +		     !SCTP_PR_PRIO_ENABLED(chk->sinfo.sinfo_flags) ||
>  		     chk->sinfo.sinfo_timetolive <= sinfo->sinfo_timetolive))
>  			continue;
>  
> -- 
> 2.1.0
> 
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