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nexthop: Extract a helper for validation of get/del RTNL requests 

Validation of messages for get / del of a next hop is the same as will be
validation of messages for get of a resilient next hop group bucket. The
difference is that policy for resilient next hop group buckets is a
superset of that used for next-hop get.

It is therefore possible to reuse the code that validates the nhmsg fields,
extracts the next-hop ID, and validates that. To that end, extract from
nh_valid_get_del_req() a helper __nh_valid_get_del_req() that does just
that.

Make the nlh argument const so that the function can be called from the
dump context, which only has a const nlh. Propagate the constness to
nh_valid_get_del_req().

Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Petr Machata 2021-01-28 13:49:24 +01:00 committed by Jakub Kicinski
parent e948217d25
commit 0bccf8ed8a
1 changed files with 28 additions and 21 deletions
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47
net/ipv4/nexthop.c
View File

@ -1872,37 +1872,44 @@ static int rtm_new_nexthop(struct sk_buff *skb, struct nlmsghdr *nlh,
return err;
}
static int nh_valid_get_del_req(struct nlmsghdr *nlh, u32 *id,
static int __nh_valid_get_del_req(const struct nlmsghdr *nlh,
struct nlattr **tb, u32 *id,
struct netlink_ext_ack *extack)
{
struct nhmsg *nhm = nlmsg_data(nlh);
if (nhm->nh_protocol || nhm->resvd || nhm->nh_scope || nhm->nh_flags) {
NL_SET_ERR_MSG(extack, "Invalid values in header");
return -EINVAL;
}
if (!tb[NHA_ID]) {
NL_SET_ERR_MSG(extack, "Nexthop id is missing");
return -EINVAL;
}
*id = nla_get_u32(tb[NHA_ID]);
if (!(*id)) {
NL_SET_ERR_MSG(extack, "Invalid nexthop id");
return -EINVAL;
}
return 0;
}
static int nh_valid_get_del_req(const struct nlmsghdr *nlh, u32 *id,
struct netlink_ext_ack *extack)
{
struct nlattr *tb[ARRAY_SIZE(rtm_nh_policy_get)];
int err;
err = nlmsg_parse(nlh, sizeof(*nhm), tb,
err = nlmsg_parse(nlh, sizeof(struct nhmsg), tb,
ARRAY_SIZE(rtm_nh_policy_get) - 1,
rtm_nh_policy_get, extack);
if (err < 0)
return err;
err = -EINVAL;
if (nhm->nh_protocol || nhm->resvd || nhm->nh_scope || nhm->nh_flags) {
NL_SET_ERR_MSG(extack, "Invalid values in header");
goto out;
}
if (!tb[NHA_ID]) {
NL_SET_ERR_MSG(extack, "Nexthop id is missing");
goto out;
}
*id = nla_get_u32(tb[NHA_ID]);
if (!(*id))
NL_SET_ERR_MSG(extack, "Invalid nexthop id");
else
err = 0;
out:
return err;
return __nh_valid_get_del_req(nlh, tb, id, extack);
}
/* rtnl */