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Date: Tue, 20 Oct 2015 23:31:42 -0700
From: "Samudrala, Sridhar" <sridhar.samudrala@...el.com>
To: Ronen Arad <ronen.arad@...el.com>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v3] netlink: Rightsize IFLA_AF_SPEC size calculation
On 10/19/2015 9:23 AM, Ronen Arad wrote:
> if_nlmsg_size() overestimates the minimum allocation size of netlink
> dump request (when called from rtnl_calcit()) or the size of the
> message (when called from rtnl_getlink()). This is because
> ext_filter_mask is not supported by rtnl_link_get_af_size() and
> rtnl_link_get_size().
>
> The over-estimation is significant when at least one netdev has many
> VLANs configured (8 bytes for each configured VLAN).
>
> This patch-set "rightsizes" the protocol specific attribute size
> calculation by propagating ext_filter_mask to rtnl_link_get_af_size()
> and adding this a argument to get_link_af_size op in rtnl_af_ops.
>
> Bridge module already used filtering aware sizing for notifications.
> br_get_link_af_size_filtered() is consistent with the modified
> get_link_af_size op so it replaces br_get_link_af_size() in br_af_ops.
> br_get_link_af_size() becomes unused and thus removed.
>
> Signed-off-by: Ronen Arad <ronen.arad@...el.com>
Acked-by: Sridhar Samudrala <sridhar.samudrala@...el.com>
> ---
> include/net/rtnetlink.h | 3 ++-
> net/bridge/br_netlink.c | 21 +--------------------
> net/core/rtnetlink.c | 8 ++++----
> net/ipv4/devinet.c | 4 ++--
> net/ipv6/addrconf.c | 3 ++-
> 5 files changed, 11 insertions(+), 28 deletions(-)
>
> diff --git a/include/net/rtnetlink.h b/include/net/rtnetlink.h
> index aff6ceb..2f87c1b 100644
> --- a/include/net/rtnetlink.h
> +++ b/include/net/rtnetlink.h
> @@ -124,7 +124,8 @@ struct rtnl_af_ops {
> int (*fill_link_af)(struct sk_buff *skb,
> const struct net_device *dev,
> u32 ext_filter_mask);
> - size_t (*get_link_af_size)(const struct net_device *dev);
> + size_t (*get_link_af_size)(const struct net_device *dev,
> + u32 ext_filter_mask);
>
> int (*validate_link_af)(const struct net_device *dev,
> const struct nlattr *attr);
> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
> index 94b4de8..40197ff 100644
> --- a/net/bridge/br_netlink.c
> +++ b/net/bridge/br_netlink.c
> @@ -1214,29 +1214,10 @@ static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
> return 0;
> }
>
> -static size_t br_get_link_af_size(const struct net_device *dev)
> -{
> - struct net_bridge_port *p;
> - struct net_bridge *br;
> - int num_vlans = 0;
> -
> - if (br_port_exists(dev)) {
> - p = br_port_get_rtnl(dev);
> - num_vlans = br_get_num_vlan_infos(nbp_vlan_group(p),
> - RTEXT_FILTER_BRVLAN);
> - } else if (dev->priv_flags & IFF_EBRIDGE) {
> - br = netdev_priv(dev);
> - num_vlans = br_get_num_vlan_infos(br_vlan_group(br),
> - RTEXT_FILTER_BRVLAN);
> - }
> -
> - /* Each VLAN is returned in bridge_vlan_info along with flags */
> - return num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
> -}
>
> static struct rtnl_af_ops br_af_ops __read_mostly = {
> .family = AF_BRIDGE,
> - .get_link_af_size = br_get_link_af_size,
> + .get_link_af_size = br_get_link_af_size_filtered,
> };
>
> struct rtnl_link_ops br_link_ops __read_mostly = {
> diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
> index 2477595..7c78b5a 100644
> --- a/net/core/rtnetlink.c
> +++ b/net/core/rtnetlink.c
> @@ -497,7 +497,8 @@ void rtnl_af_unregister(struct rtnl_af_ops *ops)
> }
> EXPORT_SYMBOL_GPL(rtnl_af_unregister);
>
> -static size_t rtnl_link_get_af_size(const struct net_device *dev)
> +static size_t rtnl_link_get_af_size(const struct net_device *dev,
> + u32 ext_filter_mask)
> {
> struct rtnl_af_ops *af_ops;
> size_t size;
> @@ -509,7 +510,7 @@ static size_t rtnl_link_get_af_size(const struct net_device *dev)
> if (af_ops->get_link_af_size) {
> /* AF_* + nested data */
> size += nla_total_size(sizeof(struct nlattr)) +
> - af_ops->get_link_af_size(dev);
> + af_ops->get_link_af_size(dev, ext_filter_mask);
> }
> }
>
> @@ -900,7 +901,7 @@ static noinline size_t if_nlmsg_size(const struct net_device *dev,
> + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
> + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
> + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
> - + rtnl_link_get_af_size(dev) /* IFLA_AF_SPEC */
> + + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
> + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
> + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
> + nla_total_size(1); /* IFLA_PROTO_DOWN */
> @@ -3443,4 +3444,3 @@ void __init rtnetlink_init(void)
> rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL);
> rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
> }
> -
> diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
> index 7350084..cebd9d3 100644
> --- a/net/ipv4/devinet.c
> +++ b/net/ipv4/devinet.c
> @@ -1644,7 +1644,8 @@ errout:
> rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
> }
>
> -static size_t inet_get_link_af_size(const struct net_device *dev)
> +static size_t inet_get_link_af_size(const struct net_device *dev,
> + u32 ext_filter_mask)
> {
> struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
>
> @@ -2398,4 +2399,3 @@ void __init devinet_init(void)
> rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
> inet_netconf_dump_devconf, NULL);
> }
> -
> diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
> index f0326aa..0645fd1 100644
> --- a/net/ipv6/addrconf.c
> +++ b/net/ipv6/addrconf.c
> @@ -4786,7 +4786,8 @@ nla_put_failure:
> return -EMSGSIZE;
> }
>
> -static size_t inet6_get_link_af_size(const struct net_device *dev)
> +static size_t inet6_get_link_af_size(const struct net_device *dev,
> + u32 ext_filter_mask)
> {
> if (!__in6_dev_get(dev))
> return 0;
--
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