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net: ipv6: addr: perform strict checks also for doit handlers 

Make RTM_GETADDR's doit handler use strict checks when
NETLINK_F_STRICT_CHK is set.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2019-01-18 10:46:21 -08:00 committed by David S. Miller
parent d044002983
commit 4b1373de73
1 changed files with 47 additions and 2 deletions
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49
net/ipv6/addrconf.c
View File

@ -5179,6 +5179,52 @@ static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
return inet6_dump_addr(skb, cb, type);
}
static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
const struct nlmsghdr *nlh,
struct nlattr **tb,
struct netlink_ext_ack *extack)
{
struct ifaddrmsg *ifm;
int i, err;
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
return -EINVAL;
}
ifm = nlmsg_data(nlh);
if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
return -EINVAL;
}
if (!netlink_strict_get_check(skb))
return nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX,
ifa_ipv6_policy, extack);
err = nlmsg_parse_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
ifa_ipv6_policy, extack);
if (err)
return err;
for (i = 0; i <= IFA_MAX; i++) {
if (!tb[i])
continue;
switch (i) {
case IFA_TARGET_NETNSID:
case IFA_ADDRESS:
case IFA_LOCAL:
break;
default:
NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
return -EINVAL;
}
}
return 0;
}
static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
@ -5199,8 +5245,7 @@ static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
struct sk_buff *skb;
int err;
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
extack);
err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
if (err < 0)
return err;