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net/sched: cls_api: add missing validation of netlink attributes 

Similarly to what has been done in 8b4c3cdd9d ("net: sched: Add policy
validation for tc attributes"), fix classifier code to add validation of
TCA_CHAIN and TCA_KIND netlink attributes.

tested with:
 # ./tdc.py -c filter

v2: Let sch_api and cls_api share nla_policy they have in common, thanks
    to David Ahern.
v3: Avoid EXPORT_SYMBOL(), as validation of those attributes is not done
    by TC modules, thanks to Cong Wang.
    While at it, restore the 'Delete / get qdisc' comment to its orginal
    position, just above tc_get_qdisc() function prototype.

Fixes: 5bc1701881 ("net: sched: introduce multichain support for filters")
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Davide Caratti 2018-10-10 22:00:58 +02:00 committed by David S. Miller
parent 58f5bbe331
commit e331473fee
2 changed files with 12 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
net/sched/cls_api.c
View File

@ -31,6 +31,8 @@
#include <net/pkt_sched.h>
#include <net/pkt_cls.h>
extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1];
/* The list of all installed classifier types */
static LIST_HEAD(tcf_proto_base);
@ -1211,7 +1213,7 @@ static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
replay:
tp_created = 0;
err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack);
err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, rtm_tca_policy, extack);
if (err < 0)
return err;
@ -1360,7 +1362,7 @@ static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
return -EPERM;
err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack);
err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, rtm_tca_policy, extack);
if (err < 0)
return err;
@ -1475,7 +1477,7 @@ static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
void *fh = NULL;
int err;
err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack);
err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, rtm_tca_policy, extack);
if (err < 0)
return err;
@ -1838,7 +1840,7 @@ static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n,
return -EPERM;
replay:
err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack);
err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, rtm_tca_policy, extack);
if (err < 0)
return err;
@ -1949,7 +1951,8 @@ static int tc_dump_chain(struct sk_buff *skb, struct netlink_callback *cb)
if (nlmsg_len(cb->nlh) < sizeof(*tcm))
return skb->len;
err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, NULL, NULL);
err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, rtm_tca_policy,
NULL);
if (err)
return err;

8
net/sched/sch_api.c
View File

@ -1307,10 +1307,6 @@ check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w)
return 0;
}
/*
* Delete/get qdisc.
*/
const struct nla_policy rtm_tca_policy[TCA_MAX + 1] = {
[TCA_KIND] = { .type = NLA_STRING },
[TCA_OPTIONS] = { .type = NLA_NESTED },
@ -1323,6 +1319,10 @@ const struct nla_policy rtm_tca_policy[TCA_MAX + 1] = {
[TCA_EGRESS_BLOCK] = { .type = NLA_U32 },
};
/*
* Delete/get qdisc.
*/
static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
struct netlink_ext_ack *extack)
{