[PATCH net-next,v3 04/12] cls_api: add translator to flow_action representation

[Pablo Neira Ayuso <pablo@netfilter.org>]

This patch implements a new function to translate from native TC action
to the new flow_action representation. Moreover, this patch also updates
cls_flower to use this new function.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
v3: add tcf_exts_num_actions() and pass it to flow_rule_alloc() to calculate
    the size of the array of actions.

 include/net/pkt_cls.h  |   5 +++
 net/sched/cls_api.c    | 116 +++++++++++++++++++++++++++++++++++++++++++++++++
 net/sched/cls_flower.c |  21 +++++++--
 3 files changed, 139 insertions(+), 3 deletions(-)

diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index 359876ee32be..abb035f84321 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -620,6 +620,11 @@ tcf_match_indev(struct sk_buff *skb, int ifindex)
 }
 #endif /* CONFIG_NET_CLS_IND */
 
+unsigned int tcf_exts_num_actions(struct tcf_exts *exts);
+
+int tc_setup_flow_action(struct flow_action *flow_action,
+			 const struct tcf_exts *exts);
+
 int tc_setup_cb_call(struct tcf_block *block, struct tcf_exts *exts,
 		     enum tc_setup_type type, void *type_data, bool err_stop);
 
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index d92f44ac4c39..6f8b953dabc4 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -31,6 +31,14 @@
 #include <net/netlink.h>
 #include <net/pkt_sched.h>
 #include <net/pkt_cls.h>
+#include <net/tc_act/tc_mirred.h>
+#include <net/tc_act/tc_vlan.h>
+#include <net/tc_act/tc_tunnel_key.h>
+#include <net/tc_act/tc_pedit.h>
+#include <net/tc_act/tc_csum.h>
+#include <net/tc_act/tc_gact.h>
+#include <net/tc_act/tc_skbedit.h>
+#include <net/tc_act/tc_mirred.h>
 
 extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1];
 
@@ -2567,6 +2575,114 @@ int tc_setup_cb_call(struct tcf_block *block, struct tcf_exts *exts,
 }
 EXPORT_SYMBOL(tc_setup_cb_call);
 
+int tc_setup_flow_action(struct flow_action *flow_action,
+			 const struct tcf_exts *exts)
+{
+	const struct tc_action *act;
+	int i, j, k;
+
+	if (!exts)
+		return 0;
+
+	j = 0;
+	tcf_exts_for_each_action(i, act, exts) {
+		struct flow_action_entry *key;
+
+		key = &flow_action->entries[j];
+		if (is_tcf_gact_ok(act)) {
+			key->id = FLOW_ACTION_ACCEPT;
+		} else if (is_tcf_gact_shot(act)) {
+			key->id = FLOW_ACTION_DROP;
+		} else if (is_tcf_gact_trap(act)) {
+			key->id = FLOW_ACTION_TRAP;
+		} else if (is_tcf_gact_goto_chain(act)) {
+			key->id = FLOW_ACTION_GOTO;
+			key->chain_index = tcf_gact_goto_chain_index(act);
+		} else if (is_tcf_mirred_egress_redirect(act)) {
+			key->id = FLOW_ACTION_REDIRECT;
+			key->dev = tcf_mirred_dev(act);
+		} else if (is_tcf_mirred_egress_mirror(act)) {
+			key->id = FLOW_ACTION_MIRRED;
+			key->dev = tcf_mirred_dev(act);
+		} else if (is_tcf_vlan(act)) {
+			switch (tcf_vlan_action(act)) {
+			case TCA_VLAN_ACT_PUSH:
+				key->id = FLOW_ACTION_VLAN_PUSH;
+				key->vlan.vid = tcf_vlan_push_vid(act);
+				key->vlan.proto = tcf_vlan_push_proto(act);
+				key->vlan.prio = tcf_vlan_push_prio(act);
+				break;
+			case TCA_VLAN_ACT_POP:
+				key->id = FLOW_ACTION_VLAN_POP;
+				break;
+			case TCA_VLAN_ACT_MODIFY:
+				key->id = FLOW_ACTION_VLAN_MANGLE;
+				key->vlan.vid = tcf_vlan_push_vid(act);
+				key->vlan.proto = tcf_vlan_push_proto(act);
+				key->vlan.prio = tcf_vlan_push_prio(act);
+				break;
+			default:
+				goto err_out;
+			}
+		} else if (is_tcf_tunnel_set(act)) {
+			key->id = FLOW_ACTION_TUNNEL_ENCAP;
+			key->tunnel = tcf_tunnel_info(act);
+		} else if (is_tcf_tunnel_release(act)) {
+			key->id = FLOW_ACTION_TUNNEL_DECAP;
+			key->tunnel = tcf_tunnel_info(act);
+		} else if (is_tcf_pedit(act)) {
+			for (k = 0; k < tcf_pedit_nkeys(act); k++) {
+				switch (tcf_pedit_cmd(act, k)) {
+				case TCA_PEDIT_KEY_EX_CMD_SET:
+					key->id = FLOW_ACTION_MANGLE;
+					break;
+				case TCA_PEDIT_KEY_EX_CMD_ADD:
+					key->id = FLOW_ACTION_ADD;
+					break;
+				default:
+					goto err_out;
+				}
+				key->mangle.htype = tcf_pedit_htype(act, k);
+				key->mangle.mask = tcf_pedit_mask(act, k);
+				key->mangle.val = tcf_pedit_val(act, k);
+				key->mangle.offset = tcf_pedit_offset(act, k);
+				key = &flow_action->entries[++j];
+			}
+		} else if (is_tcf_csum(act)) {
+			key->id = FLOW_ACTION_CSUM;
+			key->csum_flags = tcf_csum_update_flags(act);
+		} else if (is_tcf_skbedit_mark(act)) {
+			key->id = FLOW_ACTION_MARK;
+			key->mark = tcf_skbedit_mark(act);
+		} else {
+			goto err_out;
+		}
+
+		if (!is_tcf_pedit(act))
+			j++;
+	}
+	return 0;
+err_out:
+	return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL(tc_setup_flow_action);
+
+unsigned int tcf_exts_num_actions(struct tcf_exts *exts)
+{
+	unsigned int num_acts = 0;
+	struct tc_action *act;
+	int i;
+
+	tcf_exts_for_each_action(i, act, exts) {
+		if (is_tcf_pedit(act))
+			num_acts += tcf_pedit_nkeys(act);
+		else
+			num_acts++;
+	}
+	return num_acts;
+}
+EXPORT_SYMBOL(tcf_exts_num_actions);
+
 static __net_init int tcf_net_init(struct net *net)
 {
 	struct tcf_net *tn = net_generic(net, tcf_net_id);
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index d2971fbfc3d9..8898943b8ee6 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -382,7 +382,7 @@ static int fl_hw_replace_filter(struct tcf_proto *tp,
 	bool skip_sw = tc_skip_sw(f->flags);
 	int err;
 
-	cls_flower.rule = flow_rule_alloc();
+	cls_flower.rule = flow_rule_alloc(tcf_exts_num_actions(&f->exts));
 	if (!cls_flower.rule)
 		return -ENOMEM;
 
@@ -395,6 +395,12 @@ static int fl_hw_replace_filter(struct tcf_proto *tp,
 	cls_flower.exts = &f->exts;
 	cls_flower.classid = f->res.classid;
 
+	err = tc_setup_flow_action(&cls_flower.rule->action, &f->exts);
+	if (err) {
+		kfree(cls_flower.rule);
+		return err;
+	}
+
 	err = tc_setup_cb_call(block, &f->exts, TC_SETUP_CLSFLOWER,
 			       &cls_flower, skip_sw);
 	kfree(cls_flower.rule);
@@ -1467,7 +1473,8 @@ static int fl_reoffload(struct tcf_proto *tp, bool add, tc_setup_cb_t *cb,
 			if (tc_skip_hw(f->flags))
 				continue;
 
-			cls_flower.rule = flow_rule_alloc();
+			cls_flower.rule =
+				flow_rule_alloc(tcf_exts_num_actions(&f->exts));
 			if (!cls_flower.rule)
 				return -ENOMEM;
 
@@ -1480,6 +1487,14 @@ static int fl_reoffload(struct tcf_proto *tp, bool add, tc_setup_cb_t *cb,
 			cls_flower.rule->match.mask = &mask->key;
 			cls_flower.rule->match.key = &f->mkey;
 			cls_flower.exts = &f->exts;
+
+			err = tc_setup_flow_action(&cls_flower.rule->action,
+						   &f->exts);
+			if (err) {
+				kfree(cls_flower.rule);
+				return err;
+			}
+
 			cls_flower.classid = f->res.classid;
 
 			err = cb(TC_SETUP_CLSFLOWER, &cls_flower, cb_priv);
@@ -1506,7 +1521,7 @@ static int fl_hw_create_tmplt(struct tcf_chain *chain,
 	struct tcf_block *block = chain->block;
 	struct tcf_exts dummy_exts = { 0, };
 
-	cls_flower.rule = flow_rule_alloc();
+	cls_flower.rule = flow_rule_alloc(0);
 	if (!cls_flower.rule)
 		return -ENOMEM;
 
-- 
2.11.0