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net: ipv4: route: perform strict checks also for doit handlers

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

v2: - new patch (DaveA).

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 10:46:19 -08:00 committed by David S. Miller
parent eede370d65
commit a00302b607
1 changed files with 70 additions and 2 deletions
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72
net/ipv4/route.c
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@ -2763,6 +2763,75 @@ static struct sk_buff *inet_rtm_getroute_build_skb(__be32 src, __be32 dst,
return skb;
}
static int inet_rtm_valid_getroute_req(struct sk_buff *skb,
const struct nlmsghdr *nlh,
struct nlattr **tb,
struct netlink_ext_ack *extack)
{
struct rtmsg *rtm;
int i, err;
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
NL_SET_ERR_MSG(extack,
"ipv4: Invalid header for route get request");
return -EINVAL;
}
if (!netlink_strict_get_check(skb))
return nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX,
rtm_ipv4_policy, extack);
rtm = nlmsg_data(nlh);
if ((rtm->rtm_src_len && rtm->rtm_src_len != 32) ||
(rtm->rtm_dst_len && rtm->rtm_dst_len != 32) ||
rtm->rtm_table || rtm->rtm_protocol ||
rtm->rtm_scope || rtm->rtm_type) {
NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for route get request");
return -EINVAL;
}
if (rtm->rtm_flags & ~(RTM_F_NOTIFY |
RTM_F_LOOKUP_TABLE |
RTM_F_FIB_MATCH)) {
NL_SET_ERR_MSG(extack, "ipv4: Unsupported rtm_flags for route get request");
return -EINVAL;
}
err = nlmsg_parse_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
rtm_ipv4_policy, extack);
if (err)
return err;
if ((tb[RTA_SRC] && !rtm->rtm_src_len) ||
(tb[RTA_DST] && !rtm->rtm_dst_len)) {
NL_SET_ERR_MSG(extack, "ipv4: rtm_src_len and rtm_dst_len must be 32 for IPv4");
return -EINVAL;
}
for (i = 0; i <= RTA_MAX; i++) {
if (!tb[i])
continue;
switch (i) {
case RTA_IIF:
case RTA_OIF:
case RTA_SRC:
case RTA_DST:
case RTA_IP_PROTO:
case RTA_SPORT:
case RTA_DPORT:
case RTA_MARK:
case RTA_UID:
break;
default:
NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in route get request");
return -EINVAL;
}
}
return 0;
}
static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
@ -2783,8 +2852,7 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
int err;
int mark;
err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy,
extack);
err = inet_rtm_valid_getroute_req(in_skb, nlh, tb, extack);
if (err < 0)
return err;