Re: [PATCH] ipvs: sloppy TCP and SCTP

[Julian Anastasov <ja@xxxxxx>]

        Hello,

On Wed, 12 Jun 2013, Alexander Frolkin wrote:

> This adds support for sloppy TCP and SCTP mode to IPVS.
> 
> When enabled (sysctls net.ipv4.vs.sloppy_tcp and
> net.ipv4.vs.sloppy_sctp), allows IPVS to create connection state on any
> packet, not just a TCP SYN (or SCTP INIT).
> 
> This allows connections to fail over from one IPVS director to another
> mid-flight.
> 
> Signed-off-by: Alexander Frolkin <avf@xxxxxxxxxxxxxx>

        extra empty line here

> 
> ---

> diff --git a/net/netfilter/ipvs/ip_vs_proto_sctp.c 
> b/net/netfilter/ipvs/ip_vs_proto_sctp.c
> index 8646488..fd8f587 100644
> --- a/net/netfilter/ipvs/ip_vs_proto_sctp.c
> +++ b/net/netfilter/ipvs/ip_vs_proto_sctp.c

> @@ -27,13 +28,14 @@ sctp_conn_schedule(int af, struct sk_buff *skb, struct 
> ip_vs_proto_data *pd,
>       if (sch == NULL)
>               return 0;
>       net = skb_net(skb);
> +     ipvs = net_ipvs(net);
>       rcu_read_lock();
> -     if ((sch->type == SCTP_CID_INIT) &&
> +     if ((sysctl_sloppy_sctp(ipvs) || (sch->type == SCTP_CID_INIT)) &&

        Can you change the above line to:

        if ((sch->type == SCTP_CID_INIT || sysctl_sloppy_sctp(ipvs)) &&

        i.e.

1. No () around sch->type == SCTP_CID_INIT

2. Check for sch->type == SCTP_CID_INIT is usually true,
so lets try it first

> diff --git a/net/netfilter/ipvs/ip_vs_proto_tcp.c 
> b/net/netfilter/ipvs/ip_vs_proto_tcp.c
> index 50a1594..3fd23fa 100644
> --- a/net/netfilter/ipvs/ip_vs_proto_tcp.c
> +++ b/net/netfilter/ipvs/ip_vs_proto_tcp.c

> @@ -46,14 +47,15 @@ tcp_conn_schedule(int af, struct sk_buff *skb, struct 
> ip_vs_proto_data *pd,
>               return 0;
>       }
>       net = skb_net(skb);
> +     ipvs = net_ipvs(net);
>       /* No !th->ack check to allow scheduling on SYN+ACK for Active FTP */
>       rcu_read_lock();
> -     if (th->syn &&
> +     if ((sysctl_sloppy_tcp(ipvs) || th->syn) && !th->rst &&

        Same here:

        if ((th->syn || sysctl_sloppy_tcp(ipvs)) && !th->rst &&

        Also, you can check the "IPVS" entry in the
MAINTAINERS file for actual list of addresses to use (M and L)
when submitting patches.

Regards

--
Julian Anastasov <ja@xxxxxx>
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