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>

diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
index 1adc0b6..0ad9f0b 100644 (file)
--- a/include/uapi/linux/pkt_cls.h
+++ b/include/uapi/linux/pkt_cls.h
@@ -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 {

diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 29a9e6d..6c7e1f5 100644 (file)
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -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))