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net/sched: cls_flower: Add support for matching on flags 

Add UAPI to provide set of flags for matching, where the flags
provided from user-space are mapped to flow-dissector flags.

The 1st flag allows to match on whether the packet is an
IP fragment and corresponds to the FLOW_DIS_IS_FRAGMENT flag.

Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Reviewed-by: Paul Blakey <paulb@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Or Gerlitz 2016-12-07 14:03:10 +02:00 committed by David S. Miller
parent d26aac2d87
commit faa3ffce78
2 changed files with 83 additions and 0 deletions
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7
include/uapi/linux/pkt_cls.h
View File

@ -458,11 +458,18 @@ enum {
TCA_FLOWER_KEY_ENC_UDP_SRC_PORT_MASK, /* be16 */
TCA_FLOWER_KEY_ENC_UDP_DST_PORT, /* be16 */
TCA_FLOWER_KEY_ENC_UDP_DST_PORT_MASK, /* be16 */
TCA_FLOWER_KEY_FLAGS, /* be32 */
TCA_FLOWER_KEY_FLAGS_MASK, /* be32 */
__TCA_FLOWER_MAX,
};
#define TCA_FLOWER_MAX (__TCA_FLOWER_MAX - 1)
enum {
TCA_FLOWER_KEY_FLAGS_IS_FRAGMENT = (1 << 0),
};
/* Match-all classifier */
enum {

76
net/sched/cls_flower.c
View File

@ -386,6 +386,8 @@ static const struct nla_policy fl_policy[TCA_FLOWER_MAX + 1] = {
[TCA_FLOWER_KEY_ENC_UDP_SRC_PORT_MASK] = { .type = NLA_U16 },
[TCA_FLOWER_KEY_ENC_UDP_DST_PORT] = { .type = NLA_U16 },
[TCA_FLOWER_KEY_ENC_UDP_DST_PORT_MASK] = { .type = NLA_U16 },
[TCA_FLOWER_KEY_FLAGS] = { .type = NLA_U32 },
[TCA_FLOWER_KEY_FLAGS_MASK] = { .type = NLA_U32 },
};
static void fl_set_key_val(struct nlattr **tb,
@ -420,6 +422,39 @@ static void fl_set_key_vlan(struct nlattr **tb,
}
}
static void fl_set_key_flag(u32 flower_key, u32 flower_mask,
u32 *dissector_key, u32 *dissector_mask,
u32 flower_flag_bit, u32 dissector_flag_bit)
{
if (flower_mask & flower_flag_bit) {
*dissector_mask |= dissector_flag_bit;
if (flower_key & flower_flag_bit)
*dissector_key |= dissector_flag_bit;
}
}
static void fl_set_key_flags(struct nlattr **tb,
u32 *flags_key, u32 *flags_mask)
{
u32 key, mask;
if (!tb[TCA_FLOWER_KEY_FLAGS])
return;
key = be32_to_cpu(nla_get_u32(tb[TCA_FLOWER_KEY_FLAGS]));
if (!tb[TCA_FLOWER_KEY_FLAGS_MASK])
mask = ~0;
else
mask = be32_to_cpu(nla_get_u32(tb[TCA_FLOWER_KEY_FLAGS_MASK]));
*flags_key = 0;
*flags_mask = 0;
fl_set_key_flag(key, mask, flags_key, flags_mask,
TCA_FLOWER_KEY_FLAGS_IS_FRAGMENT, FLOW_DIS_IS_FRAGMENT);
}
static int fl_set_key(struct net *net, struct nlattr **tb,
struct fl_flow_key *key, struct fl_flow_key *mask)
{
@ -546,6 +581,8 @@ static int fl_set_key(struct net *net, struct nlattr **tb,
&mask->enc_tp.dst, TCA_FLOWER_KEY_ENC_UDP_DST_PORT_MASK,
sizeof(key->enc_tp.dst));
fl_set_key_flags(tb, &key->control.flags, &mask->control.flags);
return 0;
}
@ -880,6 +917,42 @@ static int fl_dump_key_vlan(struct sk_buff *skb,
return 0;
}
static void fl_get_key_flag(u32 dissector_key, u32 dissector_mask,
u32 *flower_key, u32 *flower_mask,
u32 flower_flag_bit, u32 dissector_flag_bit)
{
if (dissector_mask & dissector_flag_bit) {
*flower_mask |= flower_flag_bit;
if (dissector_key & dissector_flag_bit)
*flower_key |= flower_flag_bit;
}
}
static int fl_dump_key_flags(struct sk_buff *skb, u32 flags_key, u32 flags_mask)
{
u32 key, mask;
__be32 _key, _mask;
int err;
if (!memchr_inv(&flags_mask, 0, sizeof(flags_mask)))
return 0;
key = 0;
mask = 0;
fl_get_key_flag(flags_key, flags_mask, &key, &mask,
TCA_FLOWER_KEY_FLAGS_IS_FRAGMENT, FLOW_DIS_IS_FRAGMENT);
_key = cpu_to_be32(key);
_mask = cpu_to_be32(mask);
err = nla_put(skb, TCA_FLOWER_KEY_FLAGS, 4, &_key);
if (err)
return err;
return nla_put(skb, TCA_FLOWER_KEY_FLAGS_MASK, 4, &_mask);
}
static int fl_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
struct sk_buff *skb, struct tcmsg *t)
{
@ -1015,6 +1088,9 @@ static int fl_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
sizeof(key->enc_tp.dst)))
goto nla_put_failure;
if (fl_dump_key_flags(skb, key->control.flags, mask->control.flags))
goto nla_put_failure;
nla_put_u32(skb, TCA_FLOWER_FLAGS, f->flags);
if (tcf_exts_dump(skb, &f->exts))