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

Make RTM_GETROUTE'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 10:46:24 -08:00 committed by David S. Miller
parent 5912a7750f
commit 0eff0a2741
1 changed files with 68 additions and 2 deletions
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70
net/ipv6/route.c
View File

@ -4822,6 +4822,73 @@ int rt6_dump_route(struct fib6_info *rt, void *p_arg)
arg->cb->nlh->nlmsg_seq, flags);
}
static int inet6_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_MOD(extack,
"Invalid header for get route request");
return -EINVAL;
}
if (!netlink_strict_get_check(skb))
return nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX,
rtm_ipv6_policy, extack);
rtm = nlmsg_data(nlh);
if ((rtm->rtm_src_len && rtm->rtm_src_len != 128) ||
(rtm->rtm_dst_len && rtm->rtm_dst_len != 128) ||
rtm->rtm_table || rtm->rtm_protocol || rtm->rtm_scope ||
rtm->rtm_type) {
NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request");
return -EINVAL;
}
if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) {
NL_SET_ERR_MSG_MOD(extack,
"Invalid flags for get route request");
return -EINVAL;
}
err = nlmsg_parse_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
rtm_ipv6_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_MOD(extack, "rtm_src_len and rtm_dst_len must be 128 for IPv6");
return -EINVAL;
}
for (i = 0; i <= RTA_MAX; i++) {
if (!tb[i])
continue;
switch (i) {
case RTA_SRC:
case RTA_DST:
case RTA_IIF:
case RTA_OIF:
case RTA_MARK:
case RTA_UID:
case RTA_SPORT:
case RTA_DPORT:
case RTA_IP_PROTO:
break;
default:
NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request");
return -EINVAL;
}
}
return 0;
}
static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
@ -4836,8 +4903,7 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
struct flowi6 fl6 = {};
bool fibmatch;
err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy,
extack);
err = inet6_rtm_valid_getroute_req(in_skb, nlh, tb, extack);
if (err < 0)
goto errout;