[PATCH net-next,v5 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>
---
v5: rebase on top of net-next head.

 include/net/pkt_cls.h  |  3 ++
 net/sched/cls_api.c    | 99 ++++++++++++++++++++++++++++++++++++++++++++++++++
 net/sched/cls_flower.c | 14 +++++++
 3 files changed, 116 insertions(+)

diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index 9ceac97e5eff..abb035f84321 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -622,6 +622,9 @@ tcf_match_indev(struct sk_buff *skb, int ifindex)
 
 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 3a4d36072fd5..00b7b639f713 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -32,6 +32,13 @@
 #include <net/pkt_sched.h>
 #include <net/pkt_cls.h>
 #include <net/tc_act/tc_pedit.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_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];
 
@@ -2568,6 +2575,98 @@ 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 *entry;
+
+		entry = &flow_action->entries[j];
+		if (is_tcf_gact_ok(act)) {
+			entry->id = FLOW_ACTION_ACCEPT;
+		} else if (is_tcf_gact_shot(act)) {
+			entry->id = FLOW_ACTION_DROP;
+		} else if (is_tcf_gact_trap(act)) {
+			entry->id = FLOW_ACTION_TRAP;
+		} else if (is_tcf_gact_goto_chain(act)) {
+			entry->id = FLOW_ACTION_GOTO;
+			entry->chain_index = tcf_gact_goto_chain_index(act);
+		} else if (is_tcf_mirred_egress_redirect(act)) {
+			entry->id = FLOW_ACTION_REDIRECT;
+			entry->dev = tcf_mirred_dev(act);
+		} else if (is_tcf_mirred_egress_mirror(act)) {
+			entry->id = FLOW_ACTION_MIRRED;
+			entry->dev = tcf_mirred_dev(act);
+		} else if (is_tcf_vlan(act)) {
+			switch (tcf_vlan_action(act)) {
+			case TCA_VLAN_ACT_PUSH:
+				entry->id = FLOW_ACTION_VLAN_PUSH;
+				entry->vlan.vid = tcf_vlan_push_vid(act);
+				entry->vlan.proto = tcf_vlan_push_proto(act);
+				entry->vlan.prio = tcf_vlan_push_prio(act);
+				break;
+			case TCA_VLAN_ACT_POP:
+				entry->id = FLOW_ACTION_VLAN_POP;
+				break;
+			case TCA_VLAN_ACT_MODIFY:
+				entry->id = FLOW_ACTION_VLAN_MANGLE;
+				entry->vlan.vid = tcf_vlan_push_vid(act);
+				entry->vlan.proto = tcf_vlan_push_proto(act);
+				entry->vlan.prio = tcf_vlan_push_prio(act);
+				break;
+			default:
+				goto err_out;
+			}
+		} else if (is_tcf_tunnel_set(act)) {
+			entry->id = FLOW_ACTION_TUNNEL_ENCAP;
+			entry->tunnel = tcf_tunnel_info(act);
+		} else if (is_tcf_tunnel_release(act)) {
+			entry->id = FLOW_ACTION_TUNNEL_DECAP;
+			entry->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:
+					entry->id = FLOW_ACTION_MANGLE;
+					break;
+				case TCA_PEDIT_KEY_EX_CMD_ADD:
+					entry->id = FLOW_ACTION_ADD;
+					break;
+				default:
+					goto err_out;
+				}
+				entry->mangle.htype = tcf_pedit_htype(act, k);
+				entry->mangle.mask = tcf_pedit_mask(act, k);
+				entry->mangle.val = tcf_pedit_val(act, k);
+				entry->mangle.offset = tcf_pedit_offset(act, k);
+				entry = &flow_action->entries[++j];
+			}
+		} else if (is_tcf_csum(act)) {
+			entry->id = FLOW_ACTION_CSUM;
+			entry->csum_flags = tcf_csum_update_flags(act);
+		} else if (is_tcf_skbedit_mark(act)) {
+			entry->id = FLOW_ACTION_MARK;
+			entry->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;
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 89fcf01c04f9..ab0ad39e5fd0 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -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);
@@ -1481,6 +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);
-- 
2.11.0