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

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

v2: - improve extack messages (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 10:46:20 -08:00 committed by David S. Miller
parent a00302b607
commit d044002983
1 changed files with 56 additions and 5 deletions
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61
net/ipv4/ipmr.c
View File

@ -2467,6 +2467,61 @@ static void igmpmsg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt)
rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE_R, -ENOBUFS);
}
static int ipmr_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 multicast 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_tos || rtm->rtm_table || rtm->rtm_protocol ||
rtm->rtm_scope || rtm->rtm_type || rtm->rtm_flags) {
NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for multicast 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_SRC:
case RTA_DST:
case RTA_TABLE:
break;
default:
NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in multicast route get request");
return -EINVAL;
}
}
return 0;
}
static int ipmr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
@ -2475,18 +2530,14 @@ static int ipmr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
struct sk_buff *skb = NULL;
struct mfc_cache *cache;
struct mr_table *mrt;
struct rtmsg *rtm;
__be32 src, grp;
u32 tableid;
int err;
err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX,
rtm_ipv4_policy, extack);
err = ipmr_rtm_valid_getroute_req(in_skb, nlh, tb, extack);
if (err < 0)
goto errout;
rtm = nlmsg_data(nlh);
src = tb[RTA_SRC] ? nla_get_in_addr(tb[RTA_SRC]) : 0;
grp = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0;
tableid = tb[RTA_TABLE] ? nla_get_u32(tb[RTA_TABLE]) : 0;