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net_sched: flower: Avoid dissection of unmasked keys

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The current flower implementation checks the mask range and set all the
keys included in that range as "used_keys", even if a specific key in
the range has a zero mask.

This behavior can cause a false positive return value of
dissector_uses_key function and unnecessary dissection in
__skb_flow_dissect.

This patch checks explicitly the mask of each key and "used_keys" will
be set accordingly.

Fixes: 77b9900ef5 ('tc: introduce Flower classifier')
Signed-off-by: Hadar Hen Zion <hadarh@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hadar Hen Zion 2016-08-17 13:36:12 +03:00 committed by David S. Miller
parent f6a6692769
commit 339ba878cf
1 changed files with 13 additions and 15 deletions
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28
net/sched/cls_flower.c
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@ -404,12 +404,10 @@ static int fl_init_hashtable(struct cls_fl_head *head,
#define FL_KEY_MEMBER_OFFSET(member) offsetof(struct fl_flow_key, member)
#define FL_KEY_MEMBER_SIZE(member) (sizeof(((struct fl_flow_key *) 0)->member))
#define FL_KEY_MEMBER_END_OFFSET(member) \
(FL_KEY_MEMBER_OFFSET(member) + FL_KEY_MEMBER_SIZE(member))
#define FL_KEY_IN_RANGE(mask, member) \
(FL_KEY_MEMBER_OFFSET(member) <= (mask)->range.end && \
FL_KEY_MEMBER_END_OFFSET(member) >= (mask)->range.start)
#define FL_KEY_IS_MASKED(mask, member) \
memchr_inv(((char *)mask) + FL_KEY_MEMBER_OFFSET(member), \
0, FL_KEY_MEMBER_SIZE(member)) \
#define FL_KEY_SET(keys, cnt, id, member) \
do { \
@ -418,9 +416,9 @@ static int fl_init_hashtable(struct cls_fl_head *head,
cnt++; \
} while(0);
#define FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt, id, member) \
#define FL_KEY_SET_IF_MASKED(mask, keys, cnt, id, member) \
do { \
if (FL_KEY_IN_RANGE(mask, member)) \
if (FL_KEY_IS_MASKED(mask, member)) \
FL_KEY_SET(keys, cnt, id, member); \
} while(0);
@ -432,14 +430,14 @@ static void fl_init_dissector(struct cls_fl_head *head,
FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_CONTROL, control);
FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_BASIC, basic);
FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt,
FLOW_DISSECTOR_KEY_ETH_ADDRS, eth);
FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt,
FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4);
FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt,
FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6);
FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt,
FLOW_DISSECTOR_KEY_PORTS, tp);
FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
FLOW_DISSECTOR_KEY_ETH_ADDRS, eth);
FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4);
FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6);
FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
FLOW_DISSECTOR_KEY_PORTS, tp);
skb_flow_dissector_init(&head->dissector, keys, cnt);
}