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Date: Mon, 12 Jun 2023 11:55:34 -0400
From: Xin Long <lucien.xin@...il.com>
To: network dev <netdev@...r.kernel.org>
Cc: davem@...emloft.net,
kuba@...nel.org,
Eric Dumazet <edumazet@...gle.com>,
Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH net-next] rtnetlink: move validate_linkmsg out of do_setlink
This patch moves validate_linkmsg() out of do_setlink() to its callers
and deletes the early validate_linkmsg() call in __rtnl_newlink(), so
that it will not call validate_linkmsg() twice in either of the paths:
- __rtnl_newlink() -> do_setlink()
- __rtnl_newlink() -> rtnl_newlink_create() -> rtnl_create_link()
Additionally, as validate_linkmsg() is now only called with a real
dev, we can remove the NULL check for dev in validate_linkmsg().
Note that we moved validate_linkmsg() check to the places where it has
not done any changes to the dev, as Jakub suggested.
Signed-off-by: Xin Long <lucien.xin@...il.com>
---
net/core/rtnetlink.c | 83 ++++++++++++++++++++++----------------------
1 file changed, 42 insertions(+), 41 deletions(-)
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 41de3a2f29e1..b9824708c3bd 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2377,45 +2377,43 @@ static int rtnl_set_vf_rate(struct net_device *dev, int vf, int min_tx_rate,
static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[],
struct netlink_ext_ack *extack)
{
- if (dev) {
- if (tb[IFLA_ADDRESS] &&
- nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
- return -EINVAL;
+ if (tb[IFLA_ADDRESS] &&
+ nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
+ return -EINVAL;
- if (tb[IFLA_BROADCAST] &&
- nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
- return -EINVAL;
+ if (tb[IFLA_BROADCAST] &&
+ nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
+ return -EINVAL;
- if (tb[IFLA_GSO_MAX_SIZE] &&
- nla_get_u32(tb[IFLA_GSO_MAX_SIZE]) > dev->tso_max_size) {
- NL_SET_ERR_MSG(extack, "too big gso_max_size");
- return -EINVAL;
- }
+ if (tb[IFLA_GSO_MAX_SIZE] &&
+ nla_get_u32(tb[IFLA_GSO_MAX_SIZE]) > dev->tso_max_size) {
+ NL_SET_ERR_MSG(extack, "too big gso_max_size");
+ return -EINVAL;
+ }
- if (tb[IFLA_GSO_MAX_SEGS] &&
- (nla_get_u32(tb[IFLA_GSO_MAX_SEGS]) > GSO_MAX_SEGS ||
- nla_get_u32(tb[IFLA_GSO_MAX_SEGS]) > dev->tso_max_segs)) {
- NL_SET_ERR_MSG(extack, "too big gso_max_segs");
- return -EINVAL;
- }
+ if (tb[IFLA_GSO_MAX_SEGS] &&
+ (nla_get_u32(tb[IFLA_GSO_MAX_SEGS]) > GSO_MAX_SEGS ||
+ nla_get_u32(tb[IFLA_GSO_MAX_SEGS]) > dev->tso_max_segs)) {
+ NL_SET_ERR_MSG(extack, "too big gso_max_segs");
+ return -EINVAL;
+ }
- if (tb[IFLA_GRO_MAX_SIZE] &&
- nla_get_u32(tb[IFLA_GRO_MAX_SIZE]) > GRO_MAX_SIZE) {
- NL_SET_ERR_MSG(extack, "too big gro_max_size");
- return -EINVAL;
- }
+ if (tb[IFLA_GRO_MAX_SIZE] &&
+ nla_get_u32(tb[IFLA_GRO_MAX_SIZE]) > GRO_MAX_SIZE) {
+ NL_SET_ERR_MSG(extack, "too big gro_max_size");
+ return -EINVAL;
+ }
- if (tb[IFLA_GSO_IPV4_MAX_SIZE] &&
- nla_get_u32(tb[IFLA_GSO_IPV4_MAX_SIZE]) > dev->tso_max_size) {
- NL_SET_ERR_MSG(extack, "too big gso_ipv4_max_size");
- return -EINVAL;
- }
+ if (tb[IFLA_GSO_IPV4_MAX_SIZE] &&
+ nla_get_u32(tb[IFLA_GSO_IPV4_MAX_SIZE]) > dev->tso_max_size) {
+ NL_SET_ERR_MSG(extack, "too big gso_ipv4_max_size");
+ return -EINVAL;
+ }
- if (tb[IFLA_GRO_IPV4_MAX_SIZE] &&
- nla_get_u32(tb[IFLA_GRO_IPV4_MAX_SIZE]) > GRO_MAX_SIZE) {
- NL_SET_ERR_MSG(extack, "too big gro_ipv4_max_size");
- return -EINVAL;
- }
+ if (tb[IFLA_GRO_IPV4_MAX_SIZE] &&
+ nla_get_u32(tb[IFLA_GRO_IPV4_MAX_SIZE]) > GRO_MAX_SIZE) {
+ NL_SET_ERR_MSG(extack, "too big gro_ipv4_max_size");
+ return -EINVAL;
}
if (tb[IFLA_AF_SPEC]) {
@@ -2736,10 +2734,6 @@ static int do_setlink(const struct sk_buff *skb,
char ifname[IFNAMSIZ];
int err;
- err = validate_linkmsg(dev, tb, extack);
- if (err < 0)
- return err;
-
if (tb[IFLA_IFNAME])
nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
else
@@ -3156,6 +3150,10 @@ static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
goto errout;
}
+ err = validate_linkmsg(dev, tb, extack);
+ if (err < 0)
+ goto errout;
+
err = do_setlink(skb, dev, ifm, extack, tb, 0);
errout:
return err;
@@ -3399,6 +3397,9 @@ static int rtnl_group_changelink(const struct sk_buff *skb,
for_each_netdev_safe(net, dev, aux) {
if (dev->group == group) {
+ err = validate_linkmsg(dev, tb, extack);
+ if (err < 0)
+ return err;
err = do_setlink(skb, dev, ifm, extack, tb, 0);
if (err < 0)
return err;
@@ -3556,10 +3557,6 @@ static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
m_ops = master_dev->rtnl_link_ops;
}
- err = validate_linkmsg(dev, tb, extack);
- if (err < 0)
- return err;
-
if (tb[IFLA_LINKINFO]) {
err = nla_parse_nested_deprecated(linkinfo, IFLA_INFO_MAX,
tb[IFLA_LINKINFO],
@@ -3623,6 +3620,10 @@ static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
if (nlh->nlmsg_flags & NLM_F_REPLACE)
return -EOPNOTSUPP;
+ err = validate_linkmsg(dev, tb, extack);
+ if (err < 0)
+ return err;
+
if (linkinfo[IFLA_INFO_DATA]) {
if (!ops || ops != dev->rtnl_link_ops ||
!ops->changelink)
--
2.39.1
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