[patch net-next v2 0/5] add tcp flags match support to flower and offload it

[patch net-next v2 0/5] add tcp flags match support to flower and offload it

[Jiri Pirko]

From: Jiri Pirko <jiri@mellanox.com>

This patch adds support to dissect tcp flags, match on them using
flower classifier and offload such rules to mlxsw Spectrum devices.

---
v1->v2:
- removed no longer relevant comment from patch 1 as suggested by Or
- sent correct patches this time

Jiri Pirko (5):
  net: flow_dissector: add support for dissection of tcp flags
  net/sched: flower: add support for matching on tcp flags
  mlxsw: acl: Add tcp flags acl element
  mlxsw: spectrum: Add acl block containing tcp flags for ipv4
  mlxsw: spectrum_flower: Add support for tcp flags

 .../ethernet/mellanox/mlxsw/core_acl_flex_keys.h   |  2 ++
 .../mellanox/mlxsw/spectrum_acl_flex_keys.h        |  6 +++++
 .../ethernet/mellanox/mlxsw/spectrum_acl_tcam.c    |  1 +
 .../net/ethernet/mellanox/mlxsw/spectrum_flower.c  | 30 ++++++++++++++++++++++
 include/net/flow_dissector.h                       |  9 +++++++
 include/uapi/linux/pkt_cls.h                       |  3 +++
 net/core/flow_dissector.c                          | 29 +++++++++++++++++++++
 net/sched/cls_flower.c                             | 13 +++++++++-
 8 files changed, 92 insertions(+), 1 deletion(-)

-- 
2.9.3

[patch net-next v2 1/5] net: flow_dissector: add support for dissection of tcp flags

[Jiri Pirko]

From: Jiri Pirko <jiri@mellanox.com>

Add support for dissection of tcp flags. Uses similar function call to
tcp dissection function as arp, mpls and others.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Acked-by: Or Gerlitz <ogerlitz@mellanox.com>
---
 include/net/flow_dissector.h |  9 +++++++++
 net/core/flow_dissector.c    | 29 +++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/include/net/flow_dissector.h b/include/net/flow_dissector.h
index 8d21d44..efe34eec 100644
--- a/include/net/flow_dissector.h
+++ b/include/net/flow_dissector.h
@@ -157,6 +157,14 @@ struct flow_dissector_key_eth_addrs {
 	unsigned char src[ETH_ALEN];
 };
 
+/**
+ * struct flow_dissector_key_tcp:
+ * @flags: flags
+ */
+struct flow_dissector_key_tcp {
+	__be16 flags;
+};
+
 enum flow_dissector_key_id {
 	FLOW_DISSECTOR_KEY_CONTROL, /* struct flow_dissector_key_control */
 	FLOW_DISSECTOR_KEY_BASIC, /* struct flow_dissector_key_basic */
@@ -177,6 +185,7 @@ enum flow_dissector_key_id {
 	FLOW_DISSECTOR_KEY_ENC_CONTROL, /* struct flow_dissector_key_control */
 	FLOW_DISSECTOR_KEY_ENC_PORTS, /* struct flow_dissector_key_ports */
 	FLOW_DISSECTOR_KEY_MPLS, /* struct flow_dissector_key_mpls */
+	FLOW_DISSECTOR_KEY_TCP, /* struct flow_dissector_key_tcp */
 
 	FLOW_DISSECTOR_KEY_MAX,
 };
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 28d94bc..5a45943 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -18,6 +18,7 @@
 #include <linux/stddef.h>
 #include <linux/if_ether.h>
 #include <linux/mpls.h>
+#include <linux/tcp.h>
 #include <net/flow_dissector.h>
 #include <scsi/fc/fc_fcoe.h>
 
@@ -342,6 +343,30 @@ __skb_flow_dissect_gre(const struct sk_buff *skb,
 	return FLOW_DISSECT_RET_OUT_PROTO_AGAIN;
 }
 
+static void
+__skb_flow_dissect_tcp(const struct sk_buff *skb,
+		       struct flow_dissector *flow_dissector,
+		       void *target_container, void *data, int thoff, int hlen)
+{
+	struct flow_dissector_key_tcp *key_tcp;
+	struct tcphdr *th, _th;
+
+	if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_TCP))
+		return;
+
+	th = __skb_header_pointer(skb, thoff, sizeof(_th), data, hlen, &_th);
+	if (!th)
+		return;
+
+	if (unlikely(__tcp_hdrlen(th) < sizeof(_th)))
+		return;
+
+	key_tcp = skb_flow_dissector_target(flow_dissector,
+					    FLOW_DISSECTOR_KEY_TCP,
+					    target_container);
+	key_tcp->flags = (*(__be16 *) &tcp_flag_word(th) & htons(0x0FFF));
+}
+
 /**
  * __skb_flow_dissect - extract the flow_keys struct and return it
  * @skb: sk_buff to extract the flow from, can be NULL if the rest are specified
@@ -683,6 +708,10 @@ bool __skb_flow_dissect(const struct sk_buff *skb,
 	case IPPROTO_MPLS:
 		proto = htons(ETH_P_MPLS_UC);
 		goto mpls;
+	case IPPROTO_TCP:
+		__skb_flow_dissect_tcp(skb, flow_dissector, target_container,
+				       data, nhoff, hlen);
+		break;
 	default:
 		break;
 	}
-- 
2.9.3

[patch net-next v2 2/5] net/sched: flower: add support for matching on tcp flags

[Jiri Pirko]

From: Jiri Pirko <jiri@mellanox.com>

Benefit from the support of tcp flags dissection and allow user to
insert rules matching on tcp flags.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
---
 include/uapi/linux/pkt_cls.h |  3 +++
 net/sched/cls_flower.c       | 13 ++++++++++++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
index 1b9aa9e..c6e8cf5 100644
--- a/include/uapi/linux/pkt_cls.h
+++ b/include/uapi/linux/pkt_cls.h
@@ -451,6 +451,9 @@ enum {
 	TCA_FLOWER_KEY_MPLS_TC,		/* u8 - 3 bits */
 	TCA_FLOWER_KEY_MPLS_LABEL,	/* be32 - 20 bits */
 
+	TCA_FLOWER_KEY_TCP_FLAGS,	/* be16 */
+	TCA_FLOWER_KEY_TCP_FLAGS_MASK,	/* be16 */
+
 	__TCA_FLOWER_MAX,
 };
 
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index ca526c0..fb74a47 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -49,6 +49,7 @@ struct fl_flow_key {
 	};
 	struct flow_dissector_key_ports enc_tp;
 	struct flow_dissector_key_mpls mpls;
+	struct flow_dissector_key_tcp tcp;
 } __aligned(BITS_PER_LONG / 8); /* Ensure that we can do comparisons as longs. */
 
 struct fl_flow_mask_range {
@@ -424,6 +425,8 @@ static const struct nla_policy fl_policy[TCA_FLOWER_MAX + 1] = {
 	[TCA_FLOWER_KEY_MPLS_BOS]	= { .type = NLA_U8 },
 	[TCA_FLOWER_KEY_MPLS_TC]	= { .type = NLA_U8 },
 	[TCA_FLOWER_KEY_MPLS_LABEL]	= { .type = NLA_U32 },
+	[TCA_FLOWER_KEY_TCP_FLAGS]	= { .type = NLA_U16 },
+	[TCA_FLOWER_KEY_TCP_FLAGS_MASK]	= { .type = NLA_U16 },
 };
 
 static void fl_set_key_val(struct nlattr **tb,
@@ -596,6 +599,9 @@ static int fl_set_key(struct net *net, struct nlattr **tb,
 		fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST,
 			       &mask->tp.dst, TCA_FLOWER_KEY_TCP_DST_MASK,
 			       sizeof(key->tp.dst));
+		fl_set_key_val(tb, &key->tcp.flags, TCA_FLOWER_KEY_TCP_FLAGS,
+			       &mask->tcp.flags, TCA_FLOWER_KEY_TCP_FLAGS_MASK,
+			       sizeof(key->tcp.flags));
 	} else if (key->basic.ip_proto == IPPROTO_UDP) {
 		fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC,
 			       &mask->tp.src, TCA_FLOWER_KEY_UDP_SRC_MASK,
@@ -767,6 +773,8 @@ static void fl_init_dissector(struct cls_fl_head *head,
 	FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 			     FLOW_DISSECTOR_KEY_PORTS, tp);
 	FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
+			     FLOW_DISSECTOR_KEY_TCP, tcp);
+	FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 			     FLOW_DISSECTOR_KEY_ICMP, icmp);
 	FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
 			     FLOW_DISSECTOR_KEY_ARP, arp);
@@ -1215,7 +1223,10 @@ static int fl_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
 			     sizeof(key->tp.src)) ||
 	     fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST,
 			     &mask->tp.dst, TCA_FLOWER_KEY_TCP_DST_MASK,
-			     sizeof(key->tp.dst))))
+			     sizeof(key->tp.dst)) ||
+	     fl_dump_key_val(skb, &key->tcp.flags, TCA_FLOWER_KEY_TCP_FLAGS,
+			     &mask->tcp.flags, TCA_FLOWER_KEY_TCP_FLAGS_MASK,
+			     sizeof(key->tcp.flags))))
 		goto nla_put_failure;
 	else if (key->basic.ip_proto == IPPROTO_UDP &&
 		 (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC,
-- 
2.9.3

[patch net-next v2 3/5] mlxsw: acl: Add tcp flags acl element

[Jiri Pirko]

From: Jiri Pirko <jiri@mellanox.com>

Define new element for tcp flags and place it into scratch area.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_keys.h | 2 ++
 drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c    | 1 +
 2 files changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_keys.h b/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_keys.h
index c75e914..9807ef8 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_keys.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_keys.h
@@ -56,6 +56,7 @@ enum mlxsw_afk_element {
 	MLXSW_AFK_ELEMENT_SRC_L4_PORT,
 	MLXSW_AFK_ELEMENT_VID,
 	MLXSW_AFK_ELEMENT_PCP,
+	MLXSW_AFK_ELEMENT_TCP_FLAGS,
 	MLXSW_AFK_ELEMENT_MAX,
 };
 
@@ -102,6 +103,7 @@ static const struct mlxsw_afk_element_info mlxsw_afk_element_infos[] = {
 	MLXSW_AFK_ELEMENT_INFO_U32(IP_PROTO, 0x10, 0, 8),
 	MLXSW_AFK_ELEMENT_INFO_U32(VID, 0x10, 8, 12),
 	MLXSW_AFK_ELEMENT_INFO_U32(PCP, 0x10, 20, 3),
+	MLXSW_AFK_ELEMENT_INFO_U32(TCP_FLAGS, 0x10, 23, 9),
 	MLXSW_AFK_ELEMENT_INFO_U32(SRC_IP4, 0x18, 0, 32),
 	MLXSW_AFK_ELEMENT_INFO_U32(DST_IP4, 0x1C, 0, 32),
 	MLXSW_AFK_ELEMENT_INFO_BUF(SRC_IP6_HI, 0x18, 8),
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
index cc99de0..f7a8c3c 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
@@ -198,6 +198,7 @@ static int mlxsw_sp_flower_parse(struct mlxsw_sp *mlxsw_sp,
 	      BIT(FLOW_DISSECTOR_KEY_IPV4_ADDRS) |
 	      BIT(FLOW_DISSECTOR_KEY_IPV6_ADDRS) |
 	      BIT(FLOW_DISSECTOR_KEY_PORTS) |
+	      BIT(FLOW_DISSECTOR_KEY_TCP) |
 	      BIT(FLOW_DISSECTOR_KEY_VLAN))) {
 		dev_err(mlxsw_sp->bus_info->dev, "Unsupported key\n");
 		return -EOPNOTSUPP;
-- 
2.9.3

[patch net-next v2 4/5] mlxsw: spectrum: Add acl block containing tcp flags for ipv4

[Jiri Pirko]

From: Jiri Pirko <jiri@mellanox.com>

Add acl block called "ipv4" which contains tcp flags.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_flex_keys.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_flex_keys.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_flex_keys.h
index af7b7ba..85d5001 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_flex_keys.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_flex_keys.h
@@ -68,6 +68,11 @@ static struct mlxsw_afk_element_inst mlxsw_sp_afk_element_info_ipv4_dip[] = {
 	MLXSW_AFK_ELEMENT_INST_U32(SRC_SYS_PORT, 0x0C, 0, 16),
 };
 
+static struct mlxsw_afk_element_inst mlxsw_sp_afk_element_info_ipv4[] = {
+	MLXSW_AFK_ELEMENT_INST_U32(SRC_IP4, 0x00, 0, 32),
+	MLXSW_AFK_ELEMENT_INST_U32(TCP_FLAGS, 0x08, 8, 9), /* TCP_CONTROL+TCP_ECN */
+};
+
 static struct mlxsw_afk_element_inst mlxsw_sp_afk_element_info_ipv4_ex[] = {
 	MLXSW_AFK_ELEMENT_INST_U32(VID, 0x00, 0, 12),
 	MLXSW_AFK_ELEMENT_INST_U32(PCP, 0x08, 29, 3),
@@ -102,6 +107,7 @@ static const struct mlxsw_afk_block mlxsw_sp_afk_blocks[] = {
 	MLXSW_AFK_BLOCK(0x12, mlxsw_sp_afk_element_info_l2_smac_ex),
 	MLXSW_AFK_BLOCK(0x30, mlxsw_sp_afk_element_info_ipv4_sip),
 	MLXSW_AFK_BLOCK(0x31, mlxsw_sp_afk_element_info_ipv4_dip),
+	MLXSW_AFK_BLOCK(0x32, mlxsw_sp_afk_element_info_ipv4),
 	MLXSW_AFK_BLOCK(0x33, mlxsw_sp_afk_element_info_ipv4_ex),
 	MLXSW_AFK_BLOCK(0x60, mlxsw_sp_afk_element_info_ipv6_dip),
 	MLXSW_AFK_BLOCK(0x65, mlxsw_sp_afk_element_info_ipv6_ex1),
-- 
2.9.3

[patch net-next v2 5/5] mlxsw: spectrum_flower: Add support for tcp flags

[Jiri Pirko]

From: Jiri Pirko <jiri@mellanox.com>

Allow to offload rules that contain tcp flags within the mask.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
---
 .../ethernet/mellanox/mlxsw/spectrum_acl_tcam.c    |  1 +
 .../net/ethernet/mellanox/mlxsw/spectrum_flower.c  | 29 ++++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c
index 3a24289..61a10f1 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c
@@ -983,6 +983,7 @@ static const enum mlxsw_afk_element mlxsw_sp_acl_tcam_pattern_ipv4[] = {
 	MLXSW_AFK_ELEMENT_SRC_L4_PORT,
 	MLXSW_AFK_ELEMENT_VID,
 	MLXSW_AFK_ELEMENT_PCP,
+	MLXSW_AFK_ELEMENT_TCP_FLAGS,
 };
 
 static const enum mlxsw_afk_element mlxsw_sp_acl_tcam_pattern_ipv6[] = {
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
index f7a8c3c..ed75c6a 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
@@ -182,6 +182,32 @@ static int mlxsw_sp_flower_parse_ports(struct mlxsw_sp *mlxsw_sp,
 	return 0;
 }
 
+static int mlxsw_sp_flower_parse_tcp(struct mlxsw_sp *mlxsw_sp,
+				     struct mlxsw_sp_acl_rule_info *rulei,
+				     struct tc_cls_flower_offload *f,
+				     u8 ip_proto)
+{
+	struct flow_dissector_key_tcp *key, *mask;
+
+	if (!dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_TCP))
+		return 0;
+
+	if (ip_proto != IPPROTO_TCP) {
+		dev_err(mlxsw_sp->bus_info->dev, "TCP keys supported only for TCP\n");
+		return -EINVAL;
+	}
+
+	key = skb_flow_dissector_target(f->dissector,
+					FLOW_DISSECTOR_KEY_TCP,
+					f->key);
+	mask = skb_flow_dissector_target(f->dissector,
+					 FLOW_DISSECTOR_KEY_TCP,
+					 f->mask);
+	mlxsw_sp_acl_rulei_keymask_u32(rulei, MLXSW_AFK_ELEMENT_TCP_FLAGS,
+				       ntohs(key->flags), ntohs(mask->flags));
+	return 0;
+}
+
 static int mlxsw_sp_flower_parse(struct mlxsw_sp *mlxsw_sp,
 				 struct net_device *dev,
 				 struct mlxsw_sp_acl_rule_info *rulei,
@@ -290,6 +316,9 @@ static int mlxsw_sp_flower_parse(struct mlxsw_sp *mlxsw_sp,
 	err = mlxsw_sp_flower_parse_ports(mlxsw_sp, rulei, f, ip_proto);
 	if (err)
 		return err;
+	err = mlxsw_sp_flower_parse_tcp(mlxsw_sp, rulei, f, ip_proto);
+	if (err)
+		return err;
 
 	return mlxsw_sp_flower_parse_actions(mlxsw_sp, dev, rulei, f->exts);
 }
-- 
2.9.3

[patch iproute2] tc: flower: add support for tcp flags

[Jiri Pirko]

From: Jiri Pirko <jiri@mellanox.com>

Allow user to insert a flower classifier filter rule which includes
match for tcp flags.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
---
v1->v2:
- removed forgotten debug printout
- fixed mask parsing as reported by Or
---
 include/linux/pkt_cls.h |  3 +++
 man/man8/tc-flower.8    |  8 +++++++
 tc/f_flower.c           | 62 +++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 73 insertions(+)

diff --git a/include/linux/pkt_cls.h b/include/linux/pkt_cls.h
index d613be3..ce9dfb9 100644
--- a/include/linux/pkt_cls.h
+++ b/include/linux/pkt_cls.h
@@ -450,6 +450,9 @@ enum {
 	TCA_FLOWER_KEY_MPLS_TC,		/* u8 - 3 bits */
 	TCA_FLOWER_KEY_MPLS_LABEL,	/* be32 - 20 bits */
 
+	TCA_FLOWER_KEY_TCP_FLAGS,	/* be16 */
+	TCA_FLOWER_KEY_TCP_FLAGS_MASK,	/* be16 */
+
 	__TCA_FLOWER_MAX,
 };
 
diff --git a/man/man8/tc-flower.8 b/man/man8/tc-flower.8
index ba29065..7648079 100644
--- a/man/man8/tc-flower.8
+++ b/man/man8/tc-flower.8
@@ -35,6 +35,8 @@ flower \- flow based traffic control filter
 .IR PREFIX " | { "
 .BR dst_port " | " src_port " } "
 .IR port_number " } | "
+.B tcp_flags
+.IR MASKED_TCP_FLAGS " | "
 .B type
 .IR MASKED_TYPE " | "
 .B code
@@ -136,6 +138,12 @@ Match on layer 4 protocol source or destination port number. Only available for
 .BR ip_proto " values " udp ", " tcp  " and " sctp
 which have to be specified in beforehand.
 .TP
+.BI tcp_flags " MASKED_TCP_FLAGS"
+Match on TCP flags represented as 12bit bitfield in in hexadecimal format.
+A mask may be optionally provided to limit the bits which are matched. A mask
+is provided by following the value with a slash and then the mask. If the mask
+is missing then a match on all bits is assumed.
+.TP
 .BI type " MASKED_TYPE"
 .TQ
 .BI code " MASKED_CODE"
diff --git a/tc/f_flower.c b/tc/f_flower.c
index ebc63ca..1b6b46e 100644
--- a/tc/f_flower.c
+++ b/tc/f_flower.c
@@ -57,6 +57,7 @@ static void explain(void)
 		"                       src_ip PREFIX |\n"
 		"                       dst_port PORT-NUMBER |\n"
 		"                       src_port PORT-NUMBER |\n"
+		"                       tcp_flags MASKED-TCP_FLAGS |\n"
 		"                       type MASKED-ICMP-TYPE |\n"
 		"                       code MASKED-ICMP-CODE |\n"
 		"                       arp_tip IPV4-PREFIX |\n"
@@ -474,6 +475,41 @@ static int flower_parse_port(char *str, __u8 ip_proto,
 	return 0;
 }
 
+#define TCP_FLAGS_MAX_MASK 0xfff
+
+static int flower_parse_tcp_flags(char *str, int flags_type, int mask_type,
+				  struct nlmsghdr *n)
+{
+	char *slash;
+	int ret, err = -1;
+	__u16 flags;
+
+	slash = strchr(str, '/');
+	if (slash)
+		*slash = '\0';
+
+	ret = get_u16(&flags, str, 16);
+	if (ret < 0 || flags & ~TCP_FLAGS_MAX_MASK)
+		goto err;
+
+	addattr16(n, MAX_MSG, flags_type, htons(flags));
+
+	if (slash) {
+		ret = get_u16(&flags, slash + 1, 16);
+		if (ret < 0 || flags & ~TCP_FLAGS_MAX_MASK)
+			goto err;
+	} else {
+		flags = TCP_FLAGS_MAX_MASK;
+	}
+	addattr16(n, MAX_MSG, mask_type, htons(flags));
+
+	err = 0;
+err:
+	if (slash)
+		*slash = '/';
+	return err;
+}
+
 static int flower_parse_key_id(const char *str, int type, struct nlmsghdr *n)
 {
 	int ret;
@@ -671,6 +707,16 @@ static int flower_parse_opt(struct filter_util *qu, char *handle,
 				fprintf(stderr, "Illegal \"src_port\"\n");
 				return -1;
 			}
+		} else if (matches(*argv, "tcp_flags") == 0) {
+			NEXT_ARG();
+			ret = flower_parse_tcp_flags(*argv,
+						     TCA_FLOWER_KEY_TCP_FLAGS,
+						     TCA_FLOWER_KEY_TCP_FLAGS_MASK,
+						     n);
+			if (ret < 0) {
+				fprintf(stderr, "Illegal \"tcp_flags\"\n");
+				return -1;
+			}
 		} else if (matches(*argv, "type") == 0) {
 			NEXT_ARG();
 			ret = flower_parse_icmp(*argv, eth_type, ip_proto,
@@ -1000,6 +1046,19 @@ static void flower_print_port(FILE *f, char *name, struct rtattr *attr)
 		fprintf(f, "\n  %s %d", name, rta_getattr_be16(attr));
 }
 
+static void flower_print_tcp_flags(FILE *f, char *name,
+				  struct rtattr *flags_attr,
+				  struct rtattr *mask_attr)
+{
+	if (!flags_attr)
+		return;
+	fprintf(f, "\n  %s %x", name, rta_getattr_be16(flags_attr));
+	if (!mask_attr)
+		return;
+	fprintf(f, "/%x", rta_getattr_be16(mask_attr));
+}
+
+
 static void flower_print_key_id(FILE *f, const char *name,
 				struct rtattr *attr)
 {
@@ -1110,6 +1169,9 @@ static int flower_print_opt(struct filter_util *qu, FILE *f,
 	if (nl_type >= 0)
 		flower_print_port(f, "src_port", tb[nl_type]);
 
+	flower_print_tcp_flags(f, "tcp_flags", tb[TCA_FLOWER_KEY_TCP_FLAGS],
+			       tb[TCA_FLOWER_KEY_TCP_FLAGS_MASK]);
+
 	nl_type = flower_icmp_attr_type(eth_type, ip_proto,
 					FLOWER_ICMP_FIELD_TYPE);
 	nl_mask_type = flower_icmp_attr_mask_type(eth_type, ip_proto,
-- 
2.9.3

Re: [patch iproute2] tc: flower: add support for tcp flags

[Stephen Hemminger]

On Tue, 23 May 2017 23:51:39 +0200
Jiri Pirko <jiri@resnulli.us> wrote:

> From: Jiri Pirko <jiri@mellanox.com>
> 
> Allow user to insert a flower classifier filter rule which includes
> match for tcp flags.
> 
> Signed-off-by: Jiri Pirko <jiri@mellanox.com>

Applied to net-next

Re: [patch net-next v2 0/5] add tcp flags match support to flower and offload it

[David Miller]

From: Jiri Pirko <jiri@resnulli.us>
Date: Tue, 23 May 2017 18:40:43 +0200

> From: Jiri Pirko <jiri@mellanox.com>
> 
> This patch adds support to dissect tcp flags, match on them using
> flower classifier and offload such rules to mlxsw Spectrum devices.
> 
> ---
> v1->v2:
> - removed no longer relevant comment from patch 1 as suggested by Or
> - sent correct patches this time

Series applied, thanks.