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 optional filtering aware get_af_size_filtered op in struct rtnl_af_ops. Bridge module, which already used filtering aware sizing for notification, is enhanced to do the same for netlink dump requests. Ronen Arad (4): rtnetlink: Add get_link_af_size_filtered to rtnl_af_ops bridge: br_af_ops add br_get_link_af_size_filtered rtnetlink: Prefer filtering-aware af sizing bridge: Remove br_get_link_af_size include/net/rtnetlink.h | 2 ++ net/bridge/br_netlink.c | 23 ++--------------------- net/core/rtnetlink.c | 12 +++++++++--- 3 files changed, 13 insertions(+), 24 deletions(-) -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
