diff options
| author | Hadar Hen Zion <hadarh@mellanox.com> | 2016-08-17 13:36:12 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-05-10 10:26:21 +0200 |
| commit | 0869a49fe44d9c7b9a3828bfa18cda157b49952d (patch) | |
| tree | 81ba4bcbf9b2c78005225c1224c44a0c3f1b90ff /net/sched | |
| parent | d072303a2b5ea99de5560412d336f7a6ffdd3e7a (diff) | |
net_sched: flower: Avoid dissection of unmasked keys
commit 339ba878cfb01b68de3d281ba33fd5e4c9f76546 upstream.
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: 77b9900ef53a ('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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/sched')
| -rw-r--r-- | net/sched/cls_flower.c | 28 |
1 files changed, 13 insertions, 15 deletions
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c index 5ab8205f988b..a97096a7f801 100644 --- a/net/sched/cls_flower.c +++ b/net/sched/cls_flower.c @@ -351,12 +351,10 @@ 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 { \ @@ -365,9 +363,9 @@ 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); @@ -379,14 +377,14 @@ 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); } |