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netlink: Rightsize IFLA_AF_SPEC size calculation

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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 <[email protected]>
Acked-by: Sridhar Samudrala <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Arad, Ronen 2015-10-19 09:23:28 -07:00 • committed by David S. Miller
commit b1974ed05e
5 changed files with 11 additions and 28 deletions
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4
net/ipv4/devinet.c
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@ -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);
}