[PATCH net-next 05/14] net: rtnetlink: rtnl_fill_statsinfo(): Permit non-EMSGSIZE error returns
From: Ido Schimmel <idosch@nvidia.com>
Date: 2022-02-24 13:34:35
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Petr Machata <petrm@nvidia.com> Obtaining stats for the IFLA_STATS_LINK_OFFLOAD_XSTATS nest involves a HW access, and can fail for more reasons than just netlink message size exhaustion. Therefore do not always return -EMSGSIZE on the failure path, but respect the error code provided by the callee. Set the error explicitly where it is reasonable to assume -EMSGSIZE as the failure reason. Signed-off-by: Petr Machata <petrm@nvidia.com> Signed-off-by: Ido Schimmel <idosch@nvidia.com> --- net/core/rtnetlink.c | 22 ++++++++++++++++------ 1 file changed, 16 insertions(+), 6 deletions(-)
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 67451ec587ee..d79e2c26b494 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c@@ -5177,8 +5177,10 @@ static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev, attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64, sizeof(struct rtnl_link_stats64), IFLA_STATS_UNSPEC); - if (!attr) + if (!attr) { + err = -EMSGSIZE; goto nla_put_failure; + } sp = nla_data(attr); dev_get_stats(dev, sp);
@@ -5191,8 +5193,10 @@ static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev, *idxattr = IFLA_STATS_LINK_XSTATS; attr = nla_nest_start_noflag(skb, IFLA_STATS_LINK_XSTATS); - if (!attr) + if (!attr) { + err = -EMSGSIZE; goto nla_put_failure; + } err = ops->fill_linkxstats(skb, dev, prividx, *idxattr); nla_nest_end(skb, attr);
@@ -5214,8 +5218,10 @@ static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev, *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE; attr = nla_nest_start_noflag(skb, IFLA_STATS_LINK_XSTATS_SLAVE); - if (!attr) + if (!attr) { + err = -EMSGSIZE; goto nla_put_failure; + } err = ops->fill_linkxstats(skb, dev, prividx, *idxattr); nla_nest_end(skb, attr);
@@ -5233,8 +5239,10 @@ static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev, *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS; attr = nla_nest_start_noflag(skb, IFLA_STATS_LINK_OFFLOAD_XSTATS); - if (!attr) + if (!attr) { + err = -EMSGSIZE; goto nla_put_failure; + } err = rtnl_offload_xstats_fill(skb, dev, prividx, off_filter_mask, extack);
@@ -5253,8 +5261,10 @@ static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev, *idxattr = IFLA_STATS_AF_SPEC; attr = nla_nest_start_noflag(skb, IFLA_STATS_AF_SPEC); - if (!attr) + if (!attr) { + err = -EMSGSIZE; goto nla_put_failure; + } rcu_read_lock(); list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
@@ -5298,7 +5308,7 @@ static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev, else nlmsg_end(skb, nlh); - return -EMSGSIZE; + return err; } static size_t if_nlmsg_stats_size(const struct net_device *dev,
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2.33.1