| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Mon, 29 Apr 2013 19:12:46 +0300
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Vlad Yasevich <vyasevic@...hat.com>
Cc: netdev@...r.kernel.org, bridge@...ts.linux-foundation.org
Subject: Re: [PATCH net-next 2/2] bridge: Add a flag to control unicast
packet flood.
On Mon, Apr 29, 2013 at 11:58:22AM -0400, Vlad Yasevich wrote:
> Add a flag to control flood of unicast traffic. By default, flood is
> on and the bridge will flood unicast traffic if it doesn't know
> the destination. When the flag is turned off, unicast traffic
> without an FDB will not be forwarded to the specified port.
>
> Signed-off-by: Vlad Yasevich <vyasevic@...hat.com>
Looks sane
Reviewed-by: Michael S. Tsirkin <mst@...hat.com>
> ---
> include/uapi/linux/if_link.h | 1 +
> net/bridge/br_device.c | 8 ++++----
> net/bridge/br_forward.c | 14 +++++++++-----
> net/bridge/br_if.c | 2 +-
> net/bridge/br_input.c | 9 ++++++---
> net/bridge/br_netlink.c | 6 +++++-
> net/bridge/br_private.h | 6 ++++--
> net/bridge/br_sysfs_if.c | 2 ++
> 8 files changed, 32 insertions(+), 16 deletions(-)
>
> diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
> index 80fad7f..8d32021 100644
> --- a/include/uapi/linux/if_link.h
> +++ b/include/uapi/linux/if_link.h
> @@ -222,6 +222,7 @@ enum {
> IFLA_BRPORT_PROTECT, /* root port protection */
> IFLA_BRPORT_FAST_LEAVE, /* multicast fast leave */
> IFLA_BRPORT_LEARNING, /* mac learning */
> + IFLA_BRPORT_UNICAST_FLOOD, /* control flood of unicast traffic */
> __IFLA_BRPORT_MAX
> };
> #define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)
> diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
> index 9673128..014d690 100644
> --- a/net/bridge/br_device.c
> +++ b/net/bridge/br_device.c
> @@ -55,10 +55,10 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
> skb_pull(skb, ETH_HLEN);
>
> if (is_broadcast_ether_addr(dest))
> - br_flood_deliver(br, skb);
> + br_flood_deliver(br, skb, false);
> else if (is_multicast_ether_addr(dest)) {
> if (unlikely(netpoll_tx_running(dev))) {
> - br_flood_deliver(br, skb);
> + br_flood_deliver(br, skb, false);
> goto out;
> }
> if (br_multicast_rcv(br, NULL, skb)) {
> @@ -70,11 +70,11 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
> if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
> br_multicast_deliver(mdst, skb);
> else
> - br_flood_deliver(br, skb);
> + br_flood_deliver(br, skb, false);
> } else if ((dst = __br_fdb_get(br, dest, vid)) != NULL)
> br_deliver(dst->dst, skb);
> else
> - br_flood_deliver(br, skb);
> + br_flood_deliver(br, skb, true);
>
> out:
> rcu_read_unlock();
> diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
> index 092b20e..3ca17eb 100644
> --- a/net/bridge/br_forward.c
> +++ b/net/bridge/br_forward.c
> @@ -174,7 +174,8 @@ out:
> static void br_flood(struct net_bridge *br, struct sk_buff *skb,
> struct sk_buff *skb0,
> void (*__packet_hook)(const struct net_bridge_port *p,
> - struct sk_buff *skb))
> + struct sk_buff *skb),
> + bool unicast)
> {
> struct net_bridge_port *p;
> struct net_bridge_port *prev;
> @@ -182,6 +183,9 @@ static void br_flood(struct net_bridge *br, struct sk_buff *skb,
> prev = NULL;
>
> list_for_each_entry_rcu(p, &br->port_list, list) {
> + /* Do not flood unicast traffic to ports that turn it off */
> + if (unicast && !(p->flags & BR_UNICAST_FLOOD))
> + continue;
> prev = maybe_deliver(prev, p, skb, __packet_hook);
> if (IS_ERR(prev))
> goto out;
> @@ -203,16 +207,16 @@ out:
>
>
> /* called with rcu_read_lock */
> -void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb)
> +void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast)
> {
> - br_flood(br, skb, NULL, __br_deliver);
> + br_flood(br, skb, NULL, __br_deliver, unicast);
> }
>
> /* called under bridge lock */
> void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
> - struct sk_buff *skb2)
> + struct sk_buff *skb2, bool unicast)
> {
> - br_flood(br, skb, skb2, __br_forward);
> + br_flood(br, skb, skb2, __br_forward, unicast);
> }
>
> #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
> diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
> index 9751103..3b15668 100644
> --- a/net/bridge/br_if.c
> +++ b/net/bridge/br_if.c
> @@ -220,7 +220,7 @@ static struct net_bridge_port *new_nbp(struct net_bridge *br,
> p->path_cost = port_cost(dev);
> p->priority = 0x8000 >> BR_PORT_BITS;
> p->port_no = index;
> - p->flags = BR_LEARNING;
> + p->flags = BR_LEARNING | BR_UNICAST_FLOOD;
> br_init_port(p);
> p->state = BR_STATE_DISABLED;
> br_stp_port_timer_init(p);
> diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
> index 828e2bc..6b6a49e 100644
> --- a/net/bridge/br_input.c
> +++ b/net/bridge/br_input.c
> @@ -65,6 +65,7 @@ int br_handle_frame_finish(struct sk_buff *skb)
> struct net_bridge_fdb_entry *dst;
> struct net_bridge_mdb_entry *mdst;
> struct sk_buff *skb2;
> + bool unicast = true;
> u16 vid = 0;
>
> if (!p || p->state == BR_STATE_DISABLED)
> @@ -94,9 +95,10 @@ int br_handle_frame_finish(struct sk_buff *skb)
>
> dst = NULL;
>
> - if (is_broadcast_ether_addr(dest))
> + if (is_broadcast_ether_addr(dest)) {
> skb2 = skb;
> - else if (is_multicast_ether_addr(dest)) {
> + unicast = false;
> + } else if (is_multicast_ether_addr(dest)) {
> mdst = br_mdb_get(br, skb, vid);
> if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) {
> if ((mdst && mdst->mglist) ||
> @@ -109,6 +111,7 @@ int br_handle_frame_finish(struct sk_buff *skb)
> } else
> skb2 = skb;
>
> + unicast = false;
> br->dev->stats.multicast++;
> } else if ((dst = __br_fdb_get(br, dest, vid)) &&
> dst->is_local) {
> @@ -122,7 +125,7 @@ int br_handle_frame_finish(struct sk_buff *skb)
> dst->used = jiffies;
> br_forward(dst->dst, skb, skb2);
> } else
> - br_flood_forward(br, skb, skb2);
> + br_flood_forward(br, skb, skb2, unicast);
> }
>
> if (skb2)
> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
> index ce902bf..d27599c 100644
> --- a/net/bridge/br_netlink.c
> +++ b/net/bridge/br_netlink.c
> @@ -31,6 +31,7 @@ static inline size_t br_port_info_size(void)
> + nla_total_size(1) /* IFLA_BRPORT_PROTECT */
> + nla_total_size(1) /* IFLA_BRPORT_FAST_LEAVE */
> + nla_total_size(1) /* IFLA_BRPORT_LEARNING */
> + + nla_total_size(1) /* IFLA_BRPORT_UNICAST_FLOOD */
> + 0;
> }
>
> @@ -58,7 +59,8 @@ static int br_port_fill_attrs(struct sk_buff *skb,
> nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) ||
> nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) ||
> nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)) ||
> - nla_put_u8(skb, IFLA_BRPORT_LEARNING, !!(p->flags & BR_LEARNING)))
> + nla_put_u8(skb, IFLA_BRPORT_LEARNING, !!(p->flags & BR_LEARNING)) ||
> + nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD, !!(p->flags & BR_UNICAST_FLOOD)))
> return -EMSGSIZE;
>
> return 0;
> @@ -284,6 +286,7 @@ static const struct nla_policy ifla_brport_policy[IFLA_BRPORT_MAX + 1] = {
> [IFLA_BRPORT_GUARD] = { .type = NLA_U8 },
> [IFLA_BRPORT_PROTECT] = { .type = NLA_U8 },
> [IFLA_BRPORT_LEARNING] = { .type = NLA_U8 },
> + [IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 },
> };
>
> /* Change the state of the port and notify spanning tree */
> @@ -332,6 +335,7 @@ static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
> br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
> br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
> br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
> + br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_UNICAST_FLOOD);
>
> if (tb[IFLA_BRPORT_COST]) {
> err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
> diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
> index 67842b9..50b6f55 100644
> --- a/net/bridge/br_private.h
> +++ b/net/bridge/br_private.h
> @@ -157,6 +157,7 @@ struct net_bridge_port
> #define BR_ROOT_BLOCK 0x00000004
> #define BR_MULTICAST_FAST_LEAVE 0x00000008
> #define BR_LEARNING 0x00000010
> +#define BR_UNICAST_FLOOD 0x00000020
>
> #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
> u32 multicast_startup_queries_sent;
> @@ -411,9 +412,10 @@ extern int br_dev_queue_push_xmit(struct sk_buff *skb);
> extern void br_forward(const struct net_bridge_port *to,
> struct sk_buff *skb, struct sk_buff *skb0);
> extern int br_forward_finish(struct sk_buff *skb);
> -extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb);
> +extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb,
> + bool unicast);
> extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
> - struct sk_buff *skb2);
> + struct sk_buff *skb2, bool unicast);
>
> /* br_if.c */
> extern void br_port_carrier_check(struct net_bridge_port *p);
> diff --git a/net/bridge/br_sysfs_if.c b/net/bridge/br_sysfs_if.c
> index 707f362..ea6990f 100644
> --- a/net/bridge/br_sysfs_if.c
> +++ b/net/bridge/br_sysfs_if.c
> @@ -159,6 +159,7 @@ BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE);
> BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD);
> BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK);
> BRPORT_ATTR_FLAG(learning, BR_LEARNING);
> +BRPORT_ATTR_FLAG(unicast_flood, BR_UNICAST_FLOOD);
>
> #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
> static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
> @@ -197,6 +198,7 @@ static const struct brport_attribute *brport_attrs[] = {
> &brport_attr_bpdu_guard,
> &brport_attr_root_block,
> &brport_attr_learning,
> + &brport_attr_unicast_flood,
> #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
> &brport_attr_multicast_router,
> &brport_attr_multicast_fast_leave,
> --
> 1.7.7.6
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists