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Date: Wed, 14 Oct 2015 08:51:28 -0700
From: Ronen Arad <ronen.arad@...el.com>
To: netdev@...r.kernel.org
Cc: Ronen Arad <ronen.arad@...el.com>
Subject: [PATCH net-next v2] netlink: Rightsize IFLA_AF_SPEC size calculation
This is a v2 of a 4-parts patch with same subject.
Giving up on backward compatibility allows for much simplified single patch.
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.
---
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..581aec4 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;
--
2.1.0
--
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