From patchwork Fri Feb 1 20:01:59 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vlad Yasevich X-Patchwork-Id: 217591 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 884412C029D for ; Sat, 2 Feb 2013 08:16:29 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757764Ab3BAVQ1 (ORCPT ); Fri, 1 Feb 2013 16:16:27 -0500 Received: from mx1.redhat.com ([209.132.183.28]:11861 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757578Ab3BAVQG (ORCPT ); Fri, 1 Feb 2013 16:16:06 -0500 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r11LFaGI029044 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Fri, 1 Feb 2013 16:15:56 -0500 Received: from vyasevic.redhat.com (ovpn-113-48.phx2.redhat.com [10.3.113.48]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id r11K2AfY028344; Fri, 1 Feb 2013 15:02:12 -0500 From: Vlad Yasevich To: shemminger@vyatta.com Cc: bridge@lists.linux-foundation.org, davem@davemloft.net, netdev@vger.kernel.org Subject: [PATCH v9 net-next 01/12] bridge: Add vlan filtering infrastructure Date: Fri, 1 Feb 2013 15:01:59 -0500 Message-Id: <1359748930-31475-2-git-send-email-vyasevic@redhat.com> In-Reply-To: <1359748930-31475-1-git-send-email-vyasevic@redhat.com> References: <1359748930-31475-1-git-send-email-vyasevic@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.24 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Adds an optional infrustructure component to bridge that would allow native vlan filtering in the bridge. Each bridge port (as well as the bridge device) now get a VLAN bitmap. Each bit in the bitmap is associated with a vlan id. This way if the bit corresponding to the vid is set in the bitmap that the packet with vid is allowed to enter and exit the port. Write access the bitmap is protected by RTNL and read access protected by RCU. Vlan functionality is disabled by default. Signed-off-by: Vlad Yasevich --- net/bridge/Kconfig | 14 +++ net/bridge/Makefile | 2 + net/bridge/br_if.c | 1 + net/bridge/br_private.h | 55 +++++++++++ net/bridge/br_sysfs_br.c | 21 +++++ net/bridge/br_vlan.c | 223 ++++++++++++++++++++++++++++++++++++++++++++++ 6 files changed, 316 insertions(+), 0 deletions(-) create mode 100644 net/bridge/br_vlan.c diff --git a/net/bridge/Kconfig b/net/bridge/Kconfig index 6dee7bf..aa0d3b2 100644 --- a/net/bridge/Kconfig +++ b/net/bridge/Kconfig @@ -46,3 +46,17 @@ config BRIDGE_IGMP_SNOOPING Say N to exclude this support and reduce the binary size. If unsure, say Y. + +config BRIDGE_VLAN_FILTERING + bool "VLAN filtering" + depends on BRIDGE + depends on VLAN_8021Q + default n + ---help--- + If you say Y here, then the Ethernet bridge will be able selectively + receive and forward traffic based on VLAN information in the packet + any VLAN information configured on the bridge port or bridge device. + + Say N to exclude this support and reduce the binary size. + + If unsure, say Y. diff --git a/net/bridge/Makefile b/net/bridge/Makefile index e859098..e85498b2f 100644 --- a/net/bridge/Makefile +++ b/net/bridge/Makefile @@ -14,4 +14,6 @@ bridge-$(CONFIG_BRIDGE_NETFILTER) += br_netfilter.o bridge-$(CONFIG_BRIDGE_IGMP_SNOOPING) += br_multicast.o br_mdb.o +bridge-$(CONFIG_BRIDGE_VLAN_FILTERING) += br_vlan.o + obj-$(CONFIG_BRIDGE_NF_EBTABLES) += netfilter/ diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c index 2148d47..af9d65a 100644 --- a/net/bridge/br_if.c +++ b/net/bridge/br_if.c @@ -139,6 +139,7 @@ static void del_nbp(struct net_bridge_port *p) br_ifinfo_notify(RTM_DELLINK, p); + nbp_vlan_flush(p); br_fdb_delete_by_port(br, p, 1); list_del_rcu(&p->list); diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h index 711094a..1c1b2f1 100644 --- a/net/bridge/br_private.h +++ b/net/bridge/br_private.h @@ -18,6 +18,7 @@ #include #include #include +#include #define BR_HASH_BITS 8 #define BR_HASH_SIZE (1 << BR_HASH_BITS) @@ -26,6 +27,8 @@ #define BR_PORT_BITS 10 #define BR_MAX_PORTS (1<priv_flags & IFF_BRIDGE_PORT) @@ -260,6 +271,10 @@ struct net_bridge struct timer_list topology_change_timer; struct timer_list gc_timer; struct kobject *ifobj; +#ifdef CONFIG_BRIDGE_VLAN_FILTERING + u8 vlan_enabled; + struct net_port_vlans __rcu *vlan_info; +#endif }; struct br_input_skb_cb { @@ -534,6 +549,46 @@ static inline void br_mdb_uninit(void) } #endif +/* br_vlan.c */ +#ifdef CONFIG_BRIDGE_VLAN_FILTERING +extern int br_vlan_add(struct net_bridge *br, u16 vid); +extern int br_vlan_delete(struct net_bridge *br, u16 vid); +extern void br_vlan_flush(struct net_bridge *br); +extern int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); +extern int nbp_vlan_add(struct net_bridge_port *port, u16 vid); +extern int nbp_vlan_delete(struct net_bridge_port *port, u16 vid); +extern void nbp_vlan_flush(struct net_bridge_port *port); +#else +static inline int br_vlan_add(struct net_bridge *br, u16 vid) +{ + return -EOPNOTSUPP; +} + +static inline int br_vlan_delete(struct net_bridge *br, u16 vid) +{ + return -EOPNOTSUPP; +} + +static inline void br_vlan_flush(struct net_bridge *br) +{ +} + +static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid) +{ + return -EOPNOTSUPP; +} + +static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) +{ + return -EOPNOTSUPP; +} + +static inline void nbp_vlan_flush(struct net_bridge_port *port) +{ +} + +#endif + /* br_netfilter.c */ #ifdef CONFIG_BRIDGE_NETFILTER extern int br_netfilter_init(void); diff --git a/net/bridge/br_sysfs_br.c b/net/bridge/br_sysfs_br.c index 5913a3a..8baa9c0 100644 --- a/net/bridge/br_sysfs_br.c +++ b/net/bridge/br_sysfs_br.c @@ -691,6 +691,24 @@ static ssize_t store_nf_call_arptables( static DEVICE_ATTR(nf_call_arptables, S_IRUGO | S_IWUSR, show_nf_call_arptables, store_nf_call_arptables); #endif +#ifdef CONFIG_BRIDGE_VLAN_FILTERING +static ssize_t show_vlan_filtering(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct net_bridge *br = to_bridge(d); + return sprintf(buf, "%d\n", br->vlan_enabled); +} + +static ssize_t store_vlan_filtering(struct device *d, + struct device_attribute *attr, + const char *buf, size_t len) +{ + return store_bridge_parm(d, buf, len, br_vlan_filter_toggle); +} +static DEVICE_ATTR(vlan_filtering, S_IRUGO | S_IWUSR, + show_vlan_filtering, store_vlan_filtering); +#endif static struct attribute *bridge_attrs[] = { &dev_attr_forward_delay.attr, @@ -732,6 +750,9 @@ static struct attribute *bridge_attrs[] = { &dev_attr_nf_call_ip6tables.attr, &dev_attr_nf_call_arptables.attr, #endif +#ifdef CONFIG_BRIDGE_VLAN_FILTERING + &dev_attr_vlan_filtering.attr, +#endif NULL }; diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c new file mode 100644 index 0000000..8d9ded5 --- /dev/null +++ b/net/bridge/br_vlan.c @@ -0,0 +1,223 @@ +#include +#include +#include +#include + +#include "br_private.h" + +#define vlans_to_parent(type, pv) ((type *)(pv)->parent) + +static int __vlan_add(struct net_port_vlans *v, u16 vid) +{ + int err; + + if (test_bit(vid, v->vlan_bitmap)) + return -EEXIST; + + if (v->port_idx && vid) { + struct net_device *dev = + vlans_to_parent(struct net_bridge_port, v)->dev; + + /* Add VLAN to the device filter if it is supported. + * Stricly speaking, this is not necessary now, since devices + * are made promiscuous by the bridge, but if that ever changes + * this code will allow tagged traffic to enter the bridge. + */ + if (dev->features & NETIF_F_HW_VLAN_FILTER) { + err = dev->netdev_ops->ndo_vlan_rx_add_vid(dev, vid); + if (err) + return err; + } + } + + set_bit(vid, v->vlan_bitmap); + return 0; +} + +static int __vlan_del(struct net_port_vlans *v, u16 vid) +{ + unsigned long first_bit; + unsigned long last_bit; + + if (!test_bit(vid, v->vlan_bitmap)) + return -EINVAL; + + /* Check to see if any other vlans are in this table. If this + * is the last vlan, delete the whole structure. If this is not the + * last vlan, just clear the bit. + */ + first_bit = find_first_bit(v->vlan_bitmap, BR_VLAN_BITMAP_LEN); + last_bit = find_last_bit(v->vlan_bitmap, BR_VLAN_BITMAP_LEN); + + if (v->port_idx && vid) { + struct net_device *dev = + vlans_to_parent(struct net_bridge, v)->dev; + + if (dev->features & NETIF_F_HW_VLAN_FILTER) + dev->netdev_ops->ndo_vlan_rx_kill_vid(dev, vid); + } + + clear_bit(vid, v->vlan_bitmap); + if (first_bit == last_bit) { + if (v->port_idx) { + struct net_bridge_port *p = + vlans_to_parent(struct net_bridge_port, v); + rcu_assign_pointer(p->vlan_info, NULL); + } else { + struct net_bridge *br = + vlans_to_parent(struct net_bridge, v); + rcu_assign_pointer(br->vlan_info, NULL); + } + kfree_rcu(v, rcu); + } + return 0; +} + +static void __vlan_flush(struct net_port_vlans *v) +{ + bitmap_zero(v->vlan_bitmap, BR_VLAN_BITMAP_LEN); + if (v->port_idx) { + struct net_bridge_port *p = + vlans_to_parent(struct net_bridge_port, v); + rcu_assign_pointer(p->vlan_info, NULL); + } else { + struct net_bridge *br = + vlans_to_parent(struct net_bridge, v); + rcu_assign_pointer(br->vlan_info, NULL); + } + kfree_rcu(v, rcu); +} + +/* Must be protected by RTNL */ +int br_vlan_add(struct net_bridge *br, u16 vid) +{ + struct net_port_vlans *pv = NULL; + int err; + + ASSERT_RTNL(); + + pv = rtnl_dereference(br->vlan_info); + if (pv) + return __vlan_add(pv, vid); + + /* Create port vlan infomration + */ + pv = kzalloc(sizeof(*pv), GFP_KERNEL); + if (!pv) + return -ENOMEM; + + pv->parent = br; + err = __vlan_add(pv, vid); + if (err) + goto out; + + rcu_assign_pointer(br->vlan_info, pv); + return 0; +out: + kfree(pv); + return err; +} + +/* Must be protected by RTNL */ +int br_vlan_delete(struct net_bridge *br, u16 vid) +{ + struct net_port_vlans *pv; + + ASSERT_RTNL(); + + pv = rtnl_dereference(br->vlan_info); + if (!pv) + return -EINVAL; + + __vlan_del(pv, vid); + return 0; +} + +void br_vlan_flush(struct net_bridge *br) +{ + struct net_port_vlans *pv; + + ASSERT_RTNL(); + + pv = rtnl_dereference(br->vlan_info); + if (!pv) + return; + + __vlan_flush(pv); +} + +int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val) +{ + if (!rtnl_trylock()) + return restart_syscall(); + + if (br->vlan_enabled == val) + goto unlock; + + br->vlan_enabled = val; + +unlock: + rtnl_unlock(); + return 0; +} + +/* Must be protected by RTNL */ +int nbp_vlan_add(struct net_bridge_port *port, u16 vid) +{ + struct net_port_vlans *pv = NULL; + int err; + + ASSERT_RTNL(); + + pv = rtnl_dereference(port->vlan_info); + if (pv) + return __vlan_add(pv, vid); + + /* Create port vlan infomration + */ + pv = kzalloc(sizeof(*pv), GFP_KERNEL); + if (!pv) { + err = -ENOMEM; + goto clean_up; + } + + pv->port_idx = port->port_no; + pv->parent = port; + err = __vlan_add(pv, vid); + if (err) + goto clean_up; + + rcu_assign_pointer(port->vlan_info, pv); + return 0; + +clean_up: + kfree(pv); + return err; +} + +/* Must be protected by RTNL */ +int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) +{ + struct net_port_vlans *pv; + + ASSERT_RTNL(); + + pv = rtnl_dereference(port->vlan_info); + if (!pv) + return -EINVAL; + + return __vlan_del(pv, vid); +} + +void nbp_vlan_flush(struct net_bridge_port *port) +{ + struct net_port_vlans *pv; + + ASSERT_RTNL(); + + pv = rtnl_dereference(port->vlan_info); + if (!pv) + return; + + __vlan_flush(pv); +}