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net: rules: Move l3mdev attribute validation to a helper 

Move the check on FRA_L3MDEV attribute to helper to improve the
readability of fib_nl2rule. Update the extack messages to be
clear when the configuration option is disabled versus an invalid
value has been passed.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2018-04-24 18:36:07 -07:00 committed by David S. Miller
parent 51446780fc
commit c77bbc648f
1 changed files with 24 additions and 10 deletions
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34
net/core/fib_rules.c
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@ -454,6 +454,27 @@ static struct fib_rule *rule_find(struct fib_rules_ops *ops,
return NULL;
}
#ifdef CONFIG_NET_L3_MASTER_DEV
static int fib_nl2rule_l3mdev(struct nlattr *nla, struct fib_rule *nlrule,
struct netlink_ext_ack *extack)
{
nlrule->l3mdev = nla_get_u8(nla);
if (nlrule->l3mdev != 1) {
NL_SET_ERR_MSG(extack, "Invalid l3mdev attribute");
return -1;
}
return 0;
}
#else
static int fib_nl2rule_l3mdev(struct nlattr *nla, struct fib_rule *nlrule,
struct netlink_ext_ack *extack)
{
NL_SET_ERR_MSG(extack, "l3mdev support is not enabled in kernel");
return -1;
}
#endif
static int fib_nl2rule(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack,
struct fib_rules_ops *ops,
@ -536,16 +557,9 @@ static int fib_nl2rule(struct sk_buff *skb, struct nlmsghdr *nlh,
nlrule->tun_id = nla_get_be64(tb[FRA_TUN_ID]);
err = -EINVAL;
if (tb[FRA_L3MDEV]) {
#ifdef CONFIG_NET_L3_MASTER_DEV
nlrule->l3mdev = nla_get_u8(tb[FRA_L3MDEV]);
if (nlrule->l3mdev != 1)
#endif
{
NL_SET_ERR_MSG(extack, "Invalid l3mdev");
goto errout_free;
}
}
if (tb[FRA_L3MDEV] &&
fib_nl2rule_l3mdev(tb[FRA_L3MDEV], nlrule, extack) < 0)
goto errout_free;
nlrule->action = frh->action;
nlrule->flags = frh->flags;