netdev - Re: [PATCH net-next 2/2] cls_flower: add support for matching MPLS labels

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Date:   Mon, 27 Mar 2017 16:49:07 -0400
From:   Benjamin LaHaise <benjamin.lahaise@...ronome.com>
To:     Jiri Pirko <jiri@...nulli.us>, Jamal Hadi Salim <jhs@...atatu.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 2/2] cls_flower: add support for matching MPLS
 labels

On Mon, Mar 27, 2017 at 10:30:41PM +0200, Jiri Pirko wrote:
> Mon, Mar 27, 2017 at 08:16:02PM CEST, benjamin.lahaise@...ronome.com wrote:
> >Add support to tc flower to match based on fields in MPLS labels (TTL, 
> >Bottom of Stack, TC field, Label).
> 
> Please use scripts/get_maintainer.pl to get list of ccs for the patches
> you submit.

Oops.  Adding Jamal to the Cc -- please holler if you want me to resend.

		-ben

> 
> >
> >Signed-off-by: Benjamin LaHaise <benjamin.lahaise@...ronome.com>
> >Signed-off-by: Benjamin LaHaise <bcrl@...ck.org>
> >Reviewed-by: Simon Horman <simon.horman@...ronome.com>
> >Reviewed-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
> >
> >diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
> >index 7a69f2a..f1129e3 100644
> >--- a/include/uapi/linux/pkt_cls.h
> >+++ b/include/uapi/linux/pkt_cls.h
> >@@ -432,6 +432,11 @@ enum {
> > 	TCA_FLOWER_KEY_ARP_THA,		/* ETH_ALEN */
> > 	TCA_FLOWER_KEY_ARP_THA_MASK,	/* ETH_ALEN */
> > 
> >+	TCA_FLOWER_KEY_MPLS_TTL,	/* u8 - 8 bits */
> >+	TCA_FLOWER_KEY_MPLS_BOS,	/* u8 - 1 bit */
> >+	TCA_FLOWER_KEY_MPLS_TC,		/* u8 - 3 bits */
> >+	TCA_FLOWER_KEY_MPLS_LABEL,	/* be32 - 20 bits */
> >+
> > 	__TCA_FLOWER_MAX,
> > };
> > 
> >diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
> >index 9d0c99d..24619f9 100644
> >--- a/net/sched/cls_flower.c
> >+++ b/net/sched/cls_flower.c
> >@@ -18,6 +18,7 @@
> > #include <linux/if_ether.h>
> > #include <linux/in6.h>
> > #include <linux/ip.h>
> >+#include <linux/mpls.h>
> > 
> > #include <net/sch_generic.h>
> > #include <net/pkt_cls.h>
> >@@ -47,6 +48,7 @@ struct fl_flow_key {
> > 		struct flow_dissector_key_ipv6_addrs enc_ipv6;
> > 	};
> > 	struct flow_dissector_key_ports enc_tp;
> >+	struct flow_dissector_key_mpls mpls;
> > } __aligned(BITS_PER_LONG / 8); /* Ensure that we can do comparisons as longs. */
> > 
> > struct fl_flow_mask_range {
> >@@ -423,6 +425,10 @@ static const struct nla_policy fl_policy[TCA_FLOWER_MAX + 1] = {
> > 	[TCA_FLOWER_KEY_ARP_SHA_MASK]	= { .len = ETH_ALEN },
> > 	[TCA_FLOWER_KEY_ARP_THA]	= { .len = ETH_ALEN },
> > 	[TCA_FLOWER_KEY_ARP_THA_MASK]	= { .len = ETH_ALEN },
> >+	[TCA_FLOWER_KEY_MPLS_TTL]	= { .type = NLA_U8 },
> >+	[TCA_FLOWER_KEY_MPLS_BOS]	= { .type = NLA_U8 },
> >+	[TCA_FLOWER_KEY_MPLS_TC]	= { .type = NLA_U8 },
> >+	[TCA_FLOWER_KEY_MPLS_LABEL]	= { .type = NLA_U32 },
> > };
> > 
> > static void fl_set_key_val(struct nlattr **tb,
> >@@ -438,6 +444,36 @@ static void fl_set_key_val(struct nlattr **tb,
> > 		memcpy(mask, nla_data(tb[mask_type]), len);
> > }
> > 
> >+static void fl_set_key_mpls(struct nlattr **tb,
> >+			    struct flow_dissector_key_mpls *key_val,
> >+			    struct flow_dissector_key_mpls *key_mask)
> >+{
> >+#define MPLS_TTL_MASK	(MPLS_LS_TTL_MASK >> MPLS_LS_TTL_SHIFT)
> >+#define MPLS_BOS_MASK	(MPLS_LS_S_MASK >> MPLS_LS_S_SHIFT)
> >+#define MPLS_TC_MASK	(MPLS_LS_TC_MASK >> MPLS_LS_TC_SHIFT)
> >+#define MPLS_LABEL_MASK	(MPLS_LS_LABEL_MASK >> MPLS_LS_LABEL_SHIFT)
> >+
> >+	if (tb[TCA_FLOWER_KEY_MPLS_TTL]) {
> >+		key_val->mpls_ttl = nla_get_u8(tb[TCA_FLOWER_KEY_MPLS_TTL]);
> >+		key_mask->mpls_ttl = MPLS_TTL_MASK;
> >+	}
> >+	if (tb[TCA_FLOWER_KEY_MPLS_BOS]) {
> >+		key_val->mpls_bos = nla_get_u8(tb[TCA_FLOWER_KEY_MPLS_BOS]);
> >+		key_mask->mpls_bos = MPLS_BOS_MASK;
> >+	}
> >+	if (tb[TCA_FLOWER_KEY_MPLS_TC]) {
> >+		key_val->mpls_tc =
> >+			nla_get_u8(tb[TCA_FLOWER_KEY_MPLS_TC]) & MPLS_TC_MASK;
> >+		key_mask->mpls_tc = MPLS_TC_MASK;
> >+	}
> >+	if (tb[TCA_FLOWER_KEY_MPLS_LABEL]) {
> >+		key_val->mpls_label =
> >+			nla_get_u32(tb[TCA_FLOWER_KEY_MPLS_LABEL]) &
> >+			MPLS_LABEL_MASK;
> >+		key_mask->mpls_label = MPLS_LABEL_MASK;
> >+	}
> >+}
> >+
> > static void fl_set_key_vlan(struct nlattr **tb,
> > 			    struct flow_dissector_key_vlan *key_val,
> > 			    struct flow_dissector_key_vlan *key_mask)
> >@@ -594,6 +630,9 @@ static int fl_set_key(struct net *net, struct nlattr **tb,
> > 			       &mask->icmp.code,
> > 			       TCA_FLOWER_KEY_ICMPV6_CODE_MASK,
> > 			       sizeof(key->icmp.code));
> >+	} else if (key->basic.n_proto == htons(ETH_P_MPLS_UC) ||
> >+		   key->basic.n_proto == htons(ETH_P_MPLS_MC)) {
> >+		fl_set_key_mpls(tb, &key->mpls, &mask->mpls);
> > 	} else if (key->basic.n_proto == htons(ETH_P_ARP) ||
> > 		   key->basic.n_proto == htons(ETH_P_RARP)) {
> > 		fl_set_key_val(tb, &key->arp.sip, TCA_FLOWER_KEY_ARP_SIP,
> >@@ -730,6 +769,8 @@ static void fl_init_dissector(struct cls_fl_head *head,
> > 	FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
> > 			     FLOW_DISSECTOR_KEY_ARP, arp);
> > 	FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
> >+			     FLOW_DISSECTOR_KEY_MPLS, mpls);
> >+	FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
> > 			     FLOW_DISSECTOR_KEY_VLAN, vlan);
> > 	FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
> > 			     FLOW_DISSECTOR_KEY_ENC_KEYID, enc_key_id);
> >@@ -994,6 +1035,41 @@ static int fl_dump_key_val(struct sk_buff *skb,
> > 	return 0;
> > }
> > 
> >+static int fl_dump_key_mpls(struct sk_buff *skb,
> >+			    struct flow_dissector_key_mpls *mpls_key,
> >+			    struct flow_dissector_key_mpls *mpls_mask)
> >+{
> >+	int err;
> >+
> >+	if (!memchr_inv(mpls_mask, 0, sizeof(*mpls_mask)))
> >+		return 0;
> >+	if (mpls_mask->mpls_ttl) {
> >+		err = nla_put_u8(skb, TCA_FLOWER_KEY_MPLS_TTL,
> >+				 mpls_key->mpls_ttl);
> >+		if (err)
> >+			return err;
> >+	}
> >+	if (mpls_mask->mpls_tc) {
> >+		err = nla_put_u8(skb, TCA_FLOWER_KEY_MPLS_TC,
> >+				 mpls_key->mpls_tc);
> >+		if (err)
> >+			return err;
> >+	}
> >+	if (mpls_mask->mpls_label) {
> >+		err = nla_put_u32(skb, TCA_FLOWER_KEY_MPLS_LABEL,
> >+				  mpls_key->mpls_label);
> >+		if (err)
> >+			return err;
> >+	}
> >+	if (mpls_mask->mpls_bos) {
> >+		err = nla_put_u8(skb, TCA_FLOWER_KEY_MPLS_BOS,
> >+				 mpls_key->mpls_bos);
> >+		if (err)
> >+			return err;
> >+	}
> >+	return 0;
> >+}
> >+
> > static int fl_dump_key_vlan(struct sk_buff *skb,
> > 			    struct flow_dissector_key_vlan *vlan_key,
> > 			    struct flow_dissector_key_vlan *vlan_mask)
> >@@ -1099,6 +1175,9 @@ static int fl_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
> > 			    sizeof(key->basic.n_proto)))
> > 		goto nla_put_failure;
> > 
> >+	if (fl_dump_key_mpls(skb, &key->mpls, &mask->mpls))
> >+		goto nla_put_failure;
> >+
> > 	if (fl_dump_key_vlan(skb, &key->vlan, &mask->vlan))
> > 		goto nla_put_failure;
> > 
> >