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nexthop: Only parse NHA_OP_FLAGS for get messages that require it

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The attribute is parsed into 'op_flags' in nh_valid_get_del_req() which
is called from the handlers of three message types: RTM_DELNEXTHOP,
RTM_GETNEXTHOPBUCKET and RTM_GETNEXTHOP. The attribute is only used by
the latter and rejected by the policies of the other two.

Pass 'op_flags' as NULL from the handlers of the other two and only
parse the attribute when the argument is not NULL.

This is a preparation for a subsequent patch.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20240311162307.545385-2-idosch@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Ido Schimmel 2024-03-11 18:23:04 +02:00 committed by Jakub Kicinski
parent 5f20e6ab1f
commit dc5e0141ff
1 changed files with 8 additions and 8 deletions
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16
net/ipv4/nexthop.c
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@ -3230,10 +3230,12 @@ static int nh_valid_get_del_req(const struct nlmsghdr *nlh,
return -EINVAL;
}
if (tb[NHA_OP_FLAGS])
*op_flags = nla_get_u32(tb[NHA_OP_FLAGS]);
else
*op_flags = 0;
if (op_flags) {
if (tb[NHA_OP_FLAGS])
*op_flags = nla_get_u32(tb[NHA_OP_FLAGS]);
else
*op_flags = 0;
}
return 0;
}
@ -3250,7 +3252,6 @@ static int rtm_del_nexthop(struct sk_buff *skb, struct nlmsghdr *nlh,
.portid = NETLINK_CB(skb).portid,
};
struct nexthop *nh;
u32 op_flags;
int err;
u32 id;
@ -3259,7 +3260,7 @@ static int rtm_del_nexthop(struct sk_buff *skb, struct nlmsghdr *nlh,
if (err < 0)
return err;
err = nh_valid_get_del_req(nlh, tb, &id, &op_flags, extack);
err = nh_valid_get_del_req(nlh, tb, &id, NULL, extack);
if (err)
return err;
@ -3716,7 +3717,6 @@ static int nh_valid_get_bucket_req(const struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct nlattr *tb[NHA_MAX + 1];
u32 op_flags;
int err;
err = nlmsg_parse(nlh, sizeof(struct nhmsg), tb, NHA_MAX,
@ -3724,7 +3724,7 @@ static int nh_valid_get_bucket_req(const struct nlmsghdr *nlh,
if (err < 0)
return err;
err = nh_valid_get_del_req(nlh, tb, id, &op_flags, extack);
err = nh_valid_get_del_req(nlh, tb, id, NULL, extack);
if (err)
return err;