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net/neighbor: Update neightbl_dump_info for strict data checking 

Update neightbl_dump_info for strict data checking. If the flag is set,
the dump request is expected to have an ndtmsg struct as the header.
All elements of the struct are expected to be 0 and no attributes can
be appended.

Signed-off-by: David Ahern <dsahern@gmail.com>
Acked-by: Christian Brauner <christian@brauner.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2018-10-07 20:16:37 -07:00 committed by David S. Miller
parent 51183d233b
commit 9632d47f6a
1 changed files with 35 additions and 3 deletions
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38
net/core/neighbour.c
View File

@ -2164,15 +2164,47 @@ static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh,
return err;
}
static int neightbl_valid_dump_info(const struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct ndtmsg *ndtm;
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndtm))) {
NL_SET_ERR_MSG(extack, "Invalid header for neighbor table dump request");
return -EINVAL;
}
ndtm = nlmsg_data(nlh);
if (ndtm->ndtm_pad1 || ndtm->ndtm_pad2) {
NL_SET_ERR_MSG(extack, "Invalid values in header for neighbor table dump request");
return -EINVAL;
}
if (nlmsg_attrlen(nlh, sizeof(*ndtm))) {
NL_SET_ERR_MSG(extack, "Invalid data after header in neighbor table dump request");
return -EINVAL;
}
return 0;
}
static int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb)
{
const struct nlmsghdr *nlh = cb->nlh;
struct net *net = sock_net(skb->sk);
int family, tidx, nidx = 0;
int tbl_skip = cb->args[0];
int neigh_skip = cb->args[1];
struct neigh_table *tbl;
family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family;
if (cb->strict_check) {
int err = neightbl_valid_dump_info(nlh, cb->extack);
if (err < 0)
return err;
}
family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
for (tidx = 0; tidx < NEIGH_NR_TABLES; tidx++) {
struct neigh_parms *p;
@ -2185,7 +2217,7 @@ static int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb)
continue;
if (neightbl_fill_info(skb, tbl, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, RTM_NEWNEIGHTBL,
nlh->nlmsg_seq, RTM_NEWNEIGHTBL,
NLM_F_MULTI) < 0)
break;
@ -2200,7 +2232,7 @@ static int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb)
if (neightbl_fill_param_info(skb, tbl, p,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
nlh->nlmsg_seq,
RTM_NEWNEIGHTBL,
NLM_F_MULTI) < 0)
goto out;