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Date: Thu, 3 Jul 2008 10:40:08 -0700
From: Stephen Hemminger <shemminger@...tta.com>
To: Patrick McHardy <kaber@...sh.net>
Cc: netdev@...r.kernel.org, Patrick McHardy <kaber@...sh.net>,
davem@...emloft.net
Subject: Re: net 01/06: Add STP demux layer
On Thu, 3 Jul 2008 19:04:42 +0200 (MEST)
Patrick McHardy <kaber@...sh.net> wrote:
> net: Add STP demux layer
>
> Add small STP demux layer for demuxing STP PDUs based on MAC address.
> This is needed to run both GARP and STP in parallel (or even load the
> modules) since both use LLC_SAP_BSPAN.
>
> Signed-off-by: Patrick McHardy <kaber@...sh.net>
>
> ---
> commit 6c0be0e52a154f1991c221a6f60c6b9be71a10c8
> tree 6dcdf3d929edeae8463c6957e688f1e91ca6cfe5
> parent 44d28ab19c64d095314ac66f765d0c747519f4ed
> author Patrick McHardy <kaber@...sh.net> Thu, 03 Jul 2008 18:05:56 +0200
> committer Patrick McHardy <kaber@...sh.net> Thu, 03 Jul 2008 18:05:56 +0200
>
> include/net/stp.h | 14 +++++++
> net/802/Kconfig | 3 ++
> net/802/Makefile | 1 +
> net/802/stp.c | 102 +++++++++++++++++++++++++++++++++++++++++++++++++++++
> net/Kconfig | 1 +
> 5 files changed, 121 insertions(+), 0 deletions(-)
>
> diff --git a/include/net/stp.h b/include/net/stp.h
> new file mode 100644
> index 0000000..ad447f1
> --- /dev/null
> +++ b/include/net/stp.h
> @@ -0,0 +1,14 @@
> +#ifndef _NET_STP_H
> +#define _NET_STP_H
> +
> +struct stp_proto {
> + unsigned char group_address[ETH_ALEN];
> + void (*rcv)(const struct stp_proto *, struct sk_buff *,
> + struct net_device *);
> + void *data;
> +};
> +
> +extern int stp_proto_register(const struct stp_proto *proto);
> +extern void stp_proto_unregister(const struct stp_proto *proto);
> +
> +#endif /* _NET_STP_H */
> diff --git a/net/802/Kconfig b/net/802/Kconfig
> new file mode 100644
> index 0000000..01cb094
> --- /dev/null
> +++ b/net/802/Kconfig
> @@ -0,0 +1,3 @@
> +config STP
> + tristate
> + select LLC
> diff --git a/net/802/Makefile b/net/802/Makefile
> index 68569ff..c441d89 100644
> --- a/net/802/Makefile
> +++ b/net/802/Makefile
> @@ -10,3 +10,4 @@ obj-$(CONFIG_FDDI) += fddi.o
> obj-$(CONFIG_HIPPI) += hippi.o
> obj-$(CONFIG_IPX) += p8022.o psnap.o p8023.o
> obj-$(CONFIG_ATALK) += p8022.o psnap.o
> +obj-$(CONFIG_STP) += stp.o
> diff --git a/net/802/stp.c b/net/802/stp.c
> new file mode 100644
> index 0000000..0b7a244
> --- /dev/null
> +++ b/net/802/stp.c
> @@ -0,0 +1,102 @@
> +/*
> + * STP SAP demux
> + *
> + * Copyright (c) 2008 Patrick McHardy <kaber@...sh.net>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * version 2 as published by the Free Software Foundation.
> + */
> +#include <linux/mutex.h>
> +#include <linux/skbuff.h>
> +#include <linux/etherdevice.h>
> +#include <linux/llc.h>
> +#include <net/llc.h>
> +#include <net/llc_pdu.h>
> +#include <net/stp.h>
> +
> +/* 01:80:c2:00:00:20 - 01:80:c2:00:00:2F */
> +#define GARP_ADDR_MIN 0x20
> +#define GARP_ADDR_MAX 0x2F
> +#define GARP_ADDR_RANGE (GARP_ADDR_MAX - GARP_ADDR_MIN)
> +
> +static const struct stp_proto *garp_protos[GARP_ADDR_RANGE + 1] __read_mostly;
> +static const struct stp_proto *stp_proto __read_mostly;
> +
> +static struct llc_sap *sap __read_mostly;
> +static unsigned int sap_registered;
> +static DEFINE_MUTEX(stp_proto_mutex);
> +
> +/* Called under rcu_read_lock from LLC */
> +static int stp_pdu_rcv(struct sk_buff *skb, struct net_device *dev,
> + struct packet_type *pt, struct net_device *orig_dev)
> +{
> + const struct ethhdr *eh = eth_hdr(skb);
> + const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
> + const struct stp_proto *proto;
> +
> + if (pdu->ssap != LLC_SAP_BSPAN ||
> + pdu->dsap != LLC_SAP_BSPAN ||
> + pdu->ctrl_1 != LLC_PDU_TYPE_U)
> + goto err;
> +
> + if (eh->h_dest[5] >= GARP_ADDR_MIN && eh->h_dest[5] <= GARP_ADDR_MAX) {
> + proto = rcu_dereference(garp_protos[eh->h_dest[5] -
> + GARP_ADDR_MIN]);
> + if (proto &&
> + compare_ether_addr(eh->h_dest, proto->group_address))
> + goto err;
> + } else
> + proto = rcu_dereference(stp_proto);
> +
> + if (!proto)
> + goto err;
> +
> + proto->rcv(proto, skb, dev);
> + return 0;
> +
> +err:
> + kfree_skb(skb);
> + return 0;
> +}
> +
> +int stp_proto_register(const struct stp_proto *proto)
> +{
> + int err = 0;
> +
> + mutex_lock(&stp_proto_mutex);
> + if (sap_registered++ == 0) {
> + sap = llc_sap_open(LLC_SAP_BSPAN, stp_pdu_rcv);
> + if (!sap) {
> + err = -ENOMEM;
> + goto out;
> + }
> + }
> + if (is_zero_ether_addr(proto->group_address))
> + rcu_assign_pointer(stp_proto, proto);
> + else
> + rcu_assign_pointer(garp_protos[proto->group_address[5] -
> + GARP_ADDR_MIN], proto);
> +out:
> + mutex_unlock(&stp_proto_mutex);
> + return err;
> +}
> +EXPORT_SYMBOL_GPL(stp_proto_register);
> +
> +void stp_proto_unregister(const struct stp_proto *proto)
> +{
> + mutex_lock(&stp_proto_mutex);
> + if (is_zero_ether_addr(proto->group_address))
> + rcu_assign_pointer(stp_proto, NULL);
> + else
> + rcu_assign_pointer(garp_protos[proto->group_address[5] -
> + GARP_ADDR_MIN], NULL);
> + synchronize_rcu();
> +
> + if (--sap_registered == 0)
> + llc_sap_put(sap);
> + mutex_unlock(&stp_proto_mutex);
> +}
> +EXPORT_SYMBOL_GPL(stp_proto_unregister);
> +
> +MODULE_LICENSE("GPL");
> diff --git a/net/Kconfig b/net/Kconfig
> index acbf7c6..b986687 100644
> --- a/net/Kconfig
> +++ b/net/Kconfig
> @@ -181,6 +181,7 @@ source "net/dccp/Kconfig"
> source "net/sctp/Kconfig"
> source "net/tipc/Kconfig"
> source "net/atm/Kconfig"
> +source "net/802/Kconfig"
> source "net/bridge/Kconfig"
> source "net/8021q/Kconfig"
> source "net/decnet/Kconfig"
Why not just have LLC handle multiple registrations for same SAP?
--
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