net/sched: avoid indirect classify functions on retpoline kernels

Expose the necessary tc classifier functions and wire up cls_api to use
direct calls in retpoline kernels.
Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
Reviewed-by: Jamal Hadi Salim <jhs@mojatatu.com>
Reviewed-by: Victor Nogueira <victor@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/cls_api.c

@@ -40,6 +40,7 @@
 #include <net/tc_act/tc_mpls.h>
 #include <net/tc_act/tc_gate.h>
 #include <net/flow_offload.h>
+#include <net/tc_wrapper.h>
 
 extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1];
 
@@ -1564,7 +1565,7 @@ static inline int __tcf_classify(struct sk_buff *skb,
 		    tp->protocol != htons(ETH_P_ALL))
 			continue;
 
-		err = tp->classify(skb, tp, res);
+		err = tc_classify(skb, tp, res);
 #ifdef CONFIG_NET_CLS_ACT
 		if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) {
 			first_tp = orig_tp;

net/sched/cls_basic.c

@@ -18,6 +18,7 @@
 #include <net/netlink.h>
 #include <net/act_api.h>
 #include <net/pkt_cls.h>
+#include <net/tc_wrapper.h>
 
 struct basic_head {
 	struct list_head	flist;
@@ -36,8 +37,9 @@ struct basic_filter {
 	struct rcu_work		rwork;
 };
 
-static int basic_classify(struct sk_buff *skb, const struct tcf_proto *tp,
-			  struct tcf_result *res)
+TC_INDIRECT_SCOPE int basic_classify(struct sk_buff *skb,
+				     const struct tcf_proto *tp,
+				     struct tcf_result *res)
 {
 	int r;
 	struct basic_head *head = rcu_dereference_bh(tp->root);

net/sched/cls_bpf.c

@@ -19,6 +19,7 @@
 #include <net/rtnetlink.h>
 #include <net/pkt_cls.h>
 #include <net/sock.h>
+#include <net/tc_wrapper.h>
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Daniel Borkmann <dborkman@redhat.com>");
@@ -77,8 +78,9 @@ static int cls_bpf_exec_opcode(int code)
 	}
 }
 
-static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
-			    struct tcf_result *res)
+TC_INDIRECT_SCOPE int cls_bpf_classify(struct sk_buff *skb,
+				       const struct tcf_proto *tp,
+				       struct tcf_result *res)
 {
 	struct cls_bpf_head *head = rcu_dereference_bh(tp->root);
 	bool at_ingress = skb_at_tc_ingress(skb);

net/sched/cls_cgroup.c

@@ -13,6 +13,7 @@
 #include <net/pkt_cls.h>
 #include <net/sock.h>
 #include <net/cls_cgroup.h>
+#include <net/tc_wrapper.h>
 
 struct cls_cgroup_head {
 	u32			handle;
@@ -22,8 +23,9 @@ struct cls_cgroup_head {
 	struct rcu_work		rwork;
 };
 
-static int cls_cgroup_classify(struct sk_buff *skb, const struct tcf_proto *tp,
-			       struct tcf_result *res)
+TC_INDIRECT_SCOPE int cls_cgroup_classify(struct sk_buff *skb,
+					  const struct tcf_proto *tp,
+					  struct tcf_result *res)
 {
 	struct cls_cgroup_head *head = rcu_dereference_bh(tp->root);
 	u32 classid = task_get_classid(skb);

net/sched/cls_flow.c

@@ -24,6 +24,7 @@
 #include <net/ip.h>
 #include <net/route.h>
 #include <net/flow_dissector.h>
+#include <net/tc_wrapper.h>
 
 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
 #include <net/netfilter/nf_conntrack.h>
@@ -292,8 +293,9 @@ static u32 flow_key_get(struct sk_buff *skb, int key, struct flow_keys *flow)
 			  (1 << FLOW_KEY_NFCT_PROTO_SRC) |	\
 			  (1 << FLOW_KEY_NFCT_PROTO_DST))
 
-static int flow_classify(struct sk_buff *skb, const struct tcf_proto *tp,
-			 struct tcf_result *res)
+TC_INDIRECT_SCOPE int flow_classify(struct sk_buff *skb,
+				    const struct tcf_proto *tp,
+				    struct tcf_result *res)
 {
 	struct flow_head *head = rcu_dereference_bh(tp->root);
 	struct flow_filter *f;

net/sched/cls_flower.c

@@ -27,6 +27,7 @@
 #include <net/vxlan.h>
 #include <net/erspan.h>
 #include <net/gtp.h>
+#include <net/tc_wrapper.h>
 
 #include <net/dst.h>
 #include <net/dst_metadata.h>
@@ -305,8 +306,9 @@ static u16 fl_ct_info_to_flower_map[] = {
 					TCA_FLOWER_KEY_CT_FLAGS_NEW,
 };
 
-static int fl_classify(struct sk_buff *skb, const struct tcf_proto *tp,
-		       struct tcf_result *res)
+TC_INDIRECT_SCOPE int fl_classify(struct sk_buff *skb,
+				  const struct tcf_proto *tp,
+				  struct tcf_result *res)
 {
 	struct cls_fl_head *head = rcu_dereference_bh(tp->root);
 	bool post_ct = tc_skb_cb(skb)->post_ct;

net/sched/cls_fw.c

@@ -21,6 +21,7 @@
 #include <net/act_api.h>
 #include <net/pkt_cls.h>
 #include <net/sch_generic.h>
+#include <net/tc_wrapper.h>
 
 #define HTSIZE 256
 
@@ -47,8 +48,9 @@ static u32 fw_hash(u32 handle)
 	return handle % HTSIZE;
 }
 
-static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp,
-		       struct tcf_result *res)
+TC_INDIRECT_SCOPE int fw_classify(struct sk_buff *skb,
+				  const struct tcf_proto *tp,
+				  struct tcf_result *res)
 {
 	struct fw_head *head = rcu_dereference_bh(tp->root);
 	struct fw_filter *f;

net/sched/cls_matchall.c

@@ -12,6 +12,7 @@
 
 #include <net/sch_generic.h>
 #include <net/pkt_cls.h>
+#include <net/tc_wrapper.h>
 
 struct cls_mall_head {
 	struct tcf_exts exts;
@@ -24,8 +25,9 @@ struct cls_mall_head {
 	bool deleting;
 };
 
-static int mall_classify(struct sk_buff *skb, const struct tcf_proto *tp,
-			 struct tcf_result *res)
+TC_INDIRECT_SCOPE int mall_classify(struct sk_buff *skb,
+				    const struct tcf_proto *tp,
+				    struct tcf_result *res)
 {
 	struct cls_mall_head *head = rcu_dereference_bh(tp->root);
 

net/sched/cls_route.c

@@ -17,6 +17,7 @@
 #include <net/netlink.h>
 #include <net/act_api.h>
 #include <net/pkt_cls.h>
+#include <net/tc_wrapper.h>
 
 /*
  * 1. For now we assume that route tags < 256.
@@ -121,8 +122,9 @@ static inline int route4_hash_wild(void)
 	return 0;						\
 }
 
-static int route4_classify(struct sk_buff *skb, const struct tcf_proto *tp,
-			   struct tcf_result *res)
+TC_INDIRECT_SCOPE int route4_classify(struct sk_buff *skb,
+				      const struct tcf_proto *tp,
+				      struct tcf_result *res)
 {
 	struct route4_head *head = rcu_dereference_bh(tp->root);
 	struct dst_entry *dst;

net/sched/cls_rsvp.c

@@ -15,10 +15,12 @@
 #include <net/netlink.h>
 #include <net/act_api.h>
 #include <net/pkt_cls.h>
+#include <net/tc_wrapper.h>
 
 #define RSVP_DST_LEN	1
 #define RSVP_ID		"rsvp"
 #define RSVP_OPS	cls_rsvp_ops
+#define RSVP_CLS	rsvp_classify
 
 #include "cls_rsvp.h"
 MODULE_LICENSE("GPL");

net/sched/cls_rsvp.h

@@ -124,8 +124,8 @@ static inline unsigned int hash_src(__be32 *src)
 		return r;				\
 }
 
-static int rsvp_classify(struct sk_buff *skb, const struct tcf_proto *tp,
-			 struct tcf_result *res)
+TC_INDIRECT_SCOPE int RSVP_CLS(struct sk_buff *skb, const struct tcf_proto *tp,
+			       struct tcf_result *res)
 {
 	struct rsvp_head *head = rcu_dereference_bh(tp->root);
 	struct rsvp_session *s;
@@ -738,7 +738,7 @@ static void rsvp_bind_class(void *fh, u32 classid, unsigned long cl, void *q,
 
 static struct tcf_proto_ops RSVP_OPS __read_mostly = {
 	.kind		=	RSVP_ID,
-	.classify	=	rsvp_classify,
+	.classify	=	RSVP_CLS,
 	.init		=	rsvp_init,
 	.destroy	=	rsvp_destroy,
 	.get		=	rsvp_get,

net/sched/cls_rsvp6.c

@@ -15,10 +15,12 @@
 #include <net/act_api.h>
 #include <net/pkt_cls.h>
 #include <net/netlink.h>
+#include <net/tc_wrapper.h>
 
 #define RSVP_DST_LEN	4
 #define RSVP_ID		"rsvp6"
 #define RSVP_OPS	cls_rsvp6_ops
+#define RSVP_CLS rsvp6_classify
 
 #include "cls_rsvp.h"
 MODULE_LICENSE("GPL");

net/sched/cls_tcindex.c

@@ -16,6 +16,7 @@
 #include <net/netlink.h>
 #include <net/pkt_cls.h>
 #include <net/sch_generic.h>
+#include <net/tc_wrapper.h>
 
 /*
  * Passing parameters to the root seems to be done more awkwardly than really
@@ -98,9 +99,9 @@ static struct tcindex_filter_result *tcindex_lookup(struct tcindex_data *p,
 	return NULL;
 }
 
-
-static int tcindex_classify(struct sk_buff *skb, const struct tcf_proto *tp,
-			    struct tcf_result *res)
+TC_INDIRECT_SCOPE int tcindex_classify(struct sk_buff *skb,
+				       const struct tcf_proto *tp,
+				       struct tcf_result *res)
 {
 	struct tcindex_data *p = rcu_dereference_bh(tp->root);
 	struct tcindex_filter_result *f;

net/sched/cls_u32.c

@@ -39,6 +39,7 @@
 #include <net/act_api.h>
 #include <net/pkt_cls.h>
 #include <linux/idr.h>
+#include <net/tc_wrapper.h>
 
 struct tc_u_knode {
 	struct tc_u_knode __rcu	*next;
@@ -100,8 +101,9 @@ static inline unsigned int u32_hash_fold(__be32 key,
 	return h;
 }
 
-static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp,
-			struct tcf_result *res)
+TC_INDIRECT_SCOPE int u32_classify(struct sk_buff *skb,
+				   const struct tcf_proto *tp,
+				   struct tcf_result *res)
 {
 	struct {
 		struct tc_u_knode *knode;