flow_offload: validate flags of filter and actions

Add process to validate flags of filter and actions when adding
a tc filter.

We need to prevent adding filter with flags conflicts with its actions.
Signed-off-by: Baowen Zheng <baowen.zheng@corigine.com>
Signed-off-by: Louis Peens <louis.peens@corigine.com>
Signed-off-by: Simon Horman <simon.horman@corigine.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/act_api.h

@@ -203,7 +203,7 @@ int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
 		    struct nlattr *est,
 		    struct tc_action *actions[], int init_res[], size_t *attr_size,
-		    u32 flags, struct netlink_ext_ack *extack);
+		    u32 flags, u32 fl_flags, struct netlink_ext_ack *extack);
 struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, bool police,
 					 bool rtnl_held,
 					 struct netlink_ext_ack *extack);

include/net/pkt_cls.h

@@ -330,6 +330,9 @@ int tcf_exts_validate(struct net *net, struct tcf_proto *tp,
 		      struct nlattr **tb, struct nlattr *rate_tlv,
 		      struct tcf_exts *exts, u32 flags,
 		      struct netlink_ext_ack *extack);
+int tcf_exts_validate_ex(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
+			 struct nlattr *rate_tlv, struct tcf_exts *exts,
+			 u32 flags, u32 fl_flags, struct netlink_ext_ack *extack);
 void tcf_exts_destroy(struct tcf_exts *exts);
 void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src);
 int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts);

net/sched/act_api.c

@@ -1385,7 +1385,8 @@ static bool tc_act_bind(u32 flags)
 
 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
 		    struct nlattr *est, struct tc_action *actions[],
-		    int init_res[], size_t *attr_size, u32 flags,
+		    int init_res[], size_t *attr_size,
+		    u32 flags, u32 fl_flags,
 		    struct netlink_ext_ack *extack)
 {
 	struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {};
@@ -1423,7 +1424,18 @@ int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
 		sz += tcf_action_fill_size(act);
 		/* Start from index 0 */
 		actions[i - 1] = act;
-		if (!tc_act_bind(flags)) {
+		if (tc_act_bind(flags)) {
+			bool skip_sw = tc_skip_sw(fl_flags);
+			bool skip_hw = tc_skip_hw(fl_flags);
+
+			if (tc_act_bind(act->tcfa_flags))
+				continue;
+			if (skip_sw != tc_act_skip_sw(act->tcfa_flags) ||
+			    skip_hw != tc_act_skip_hw(act->tcfa_flags)) {
+				err = -EINVAL;
+				goto err;
+			}
+		} else {
 			err = tcf_action_offload_add(act, extack);
 			if (tc_act_skip_sw(act->tcfa_flags) && err)
 				goto err;
@@ -1926,7 +1938,7 @@ static int tcf_action_add(struct net *net, struct nlattr *nla,
 
 	for (loop = 0; loop < 10; loop++) {
 		ret = tcf_action_init(net, NULL, nla, NULL, actions, init_res,
-				      &attr_size, flags, extack);
+				      &attr_size, flags, 0, extack);
 		if (ret != -EAGAIN)
 			break;
 	}

net/sched/cls_api.c

@@ -3025,9 +3025,9 @@ void tcf_exts_destroy(struct tcf_exts *exts)
 }
 EXPORT_SYMBOL(tcf_exts_destroy);
 
-int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
+int tcf_exts_validate_ex(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
 			 struct nlattr *rate_tlv, struct tcf_exts *exts,
-		      u32 flags, struct netlink_ext_ack *extack)
+			 u32 flags, u32 fl_flags, struct netlink_ext_ack *extack)
 {
 #ifdef CONFIG_NET_CLS_ACT
 	{
@@ -3061,7 +3061,8 @@ int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
 			flags |= TCA_ACT_FLAGS_BIND;
 			err = tcf_action_init(net, tp, tb[exts->action],
 					      rate_tlv, exts->actions, init_res,
-					      &attr_size, flags, extack);
+					      &attr_size, flags, fl_flags,
+					      extack);
 			if (err < 0)
 				return err;
 			exts->nr_actions = err;
@@ -3077,6 +3078,15 @@ int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
 
 	return 0;
 }
+EXPORT_SYMBOL(tcf_exts_validate_ex);
+
+int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
+		      struct nlattr *rate_tlv, struct tcf_exts *exts,
+		      u32 flags, struct netlink_ext_ack *extack)
+{
+	return tcf_exts_validate_ex(net, tp, tb, rate_tlv, exts,
+				    flags, 0, extack);
+}
 EXPORT_SYMBOL(tcf_exts_validate);
 
 void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src)

net/sched/cls_flower.c

@@ -1917,12 +1917,14 @@ static int fl_set_parms(struct net *net, struct tcf_proto *tp,
 			struct cls_fl_filter *f, struct fl_flow_mask *mask,
 			unsigned long base, struct nlattr **tb,
 			struct nlattr *est,
-			struct fl_flow_tmplt *tmplt, u32 flags,
+			struct fl_flow_tmplt *tmplt,
+			u32 flags, u32 fl_flags,
 			struct netlink_ext_ack *extack)
 {
 	int err;
 
-	err = tcf_exts_validate(net, tp, tb, est, &f->exts, flags, extack);
+	err = tcf_exts_validate_ex(net, tp, tb, est, &f->exts, flags,
+				   fl_flags, extack);
 	if (err < 0)
 		return err;
 
@@ -2036,7 +2038,8 @@ static int fl_change(struct net *net, struct sk_buff *in_skb,
 	}
 
 	err = fl_set_parms(net, tp, fnew, mask, base, tb, tca[TCA_RATE],
-			   tp->chain->tmplt_priv, flags, extack);
+			   tp->chain->tmplt_priv, flags, fnew->flags,
+			   extack);
 	if (err)
 		goto errout;
 

net/sched/cls_matchall.c

@@ -163,12 +163,13 @@ static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = {
 static int mall_set_parms(struct net *net, struct tcf_proto *tp,
 			  struct cls_mall_head *head,
 			  unsigned long base, struct nlattr **tb,
-			  struct nlattr *est, u32 flags,
+			  struct nlattr *est, u32 flags, u32 fl_flags,
 			  struct netlink_ext_ack *extack)
 {
 	int err;
 
-	err = tcf_exts_validate(net, tp, tb, est, &head->exts, flags, extack);
+	err = tcf_exts_validate_ex(net, tp, tb, est, &head->exts, flags,
+				   fl_flags, extack);
 	if (err < 0)
 		return err;
 
@@ -226,8 +227,8 @@ static int mall_change(struct net *net, struct sk_buff *in_skb,
 		goto err_alloc_percpu;
 	}
 
-	err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], flags,
-			     extack);
+	err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE],
+			     flags, new->flags, extack);
 	if (err)
 		goto err_set_parms;
 

net/sched/cls_u32.c

@@ -709,12 +709,13 @@ static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
 static int u32_set_parms(struct net *net, struct tcf_proto *tp,
 			 unsigned long base,
 			 struct tc_u_knode *n, struct nlattr **tb,
-			 struct nlattr *est, u32 flags,
+			 struct nlattr *est, u32 flags, u32 fl_flags,
 			 struct netlink_ext_ack *extack)
 {
 	int err;
 
-	err = tcf_exts_validate(net, tp, tb, est, &n->exts, flags, extack);
+	err = tcf_exts_validate_ex(net, tp, tb, est, &n->exts, flags,
+				   fl_flags, extack);
 	if (err < 0)
 		return err;
 
@@ -895,7 +896,8 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
 			return -ENOMEM;
 
 		err = u32_set_parms(net, tp, base, new, tb,
-				    tca[TCA_RATE], flags, extack);
+				    tca[TCA_RATE], flags, new->flags,
+				    extack);
 
 		if (err) {
 			u32_destroy_key(new, false);
@@ -1060,8 +1062,8 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
 	}
 #endif
 
-	err = u32_set_parms(net, tp, base, n, tb, tca[TCA_RATE], flags,
-			    extack);
+	err = u32_set_parms(net, tp, base, n, tb, tca[TCA_RATE],
+			    flags, n->flags, extack);
 	if (err == 0) {
 		struct tc_u_knode __rcu **ins;
 		struct tc_u_knode *pins;