net: sched: remove tcf_proto from ematch calls

This removes the tcf_proto argument from the ematch code paths that
only need it to reference the net namespace. This allows simplifying
qdisc code paths especially when we need to tear down the ematch
from an RCU callback. In this case we can not guarentee that the
tcf_proto structure is still valid.

Signed-off-by: John Fastabend <[e-mail]>
Acked-by: Cong Wang <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/net/pkt_cls.h

···
 	unsigned int		datalen;
 	u16			matchid;
 	u16			flags;
+	struct net		*net;
 };
 
 static inline int tcf_em_is_container(struct tcf_ematch *em)
···
 struct tcf_ematch_ops {
 	int			kind;
 	int			datalen;
-	int			(*change)(struct tcf_proto *, void *,
+	int			(*change)(struct net *net, void *,
 					  int, struct tcf_ematch *);
 	int			(*match)(struct sk_buff *, struct tcf_ematch *,
 					 struct tcf_pkt_info *);
-	void			(*destroy)(struct tcf_proto *,
-					   struct tcf_ematch *);
+	void			(*destroy)(struct tcf_ematch *);
 	int			(*dump)(struct sk_buff *, struct tcf_ematch *);
 	struct module		*owner;
 	struct list_head	link;
···
 void tcf_em_unregister(struct tcf_ematch_ops *);
 int tcf_em_tree_validate(struct tcf_proto *, struct nlattr *,
 			 struct tcf_ematch_tree *);
-void tcf_em_tree_destroy(struct tcf_proto *, struct tcf_ematch_tree *);
+void tcf_em_tree_destroy(struct tcf_ematch_tree *);
 int tcf_em_tree_dump(struct sk_buff *, struct tcf_ematch_tree *, int);
 int __tcf_em_tree_match(struct sk_buff *, struct tcf_ematch_tree *,
 			struct tcf_pkt_info *);
···
 };
 
 #define tcf_em_tree_validate(tp, tb, t) ((void)(t), 0)
-#define tcf_em_tree_destroy(tp, t) do { (void)(t); } while(0)
+#define tcf_em_tree_destroy(t) do { (void)(t); } while(0)
 #define tcf_em_tree_dump(skb, t, tlv) (0)
 #define tcf_em_tree_change(tp, dst, src) do { } while(0)
 #define tcf_em_tree_match(skb, t, info) ((void)(info), 1)

net/sched/cls_basic.c

···
 
 	tcf_unbind_filter(tp, &f->res);
 	tcf_exts_destroy(&f->exts);
-	tcf_em_tree_destroy(tp, &f->ematches);
+	tcf_em_tree_destroy(&f->ematches);
 	kfree(f);
 }
 

net/sched/cls_cgroup.c

···
 						    rcu);
 
 	tcf_exts_destroy(&head->exts);
-	tcf_em_tree_destroy(head->tp, &head->ematches);
+	tcf_em_tree_destroy(&head->ematches);
 	kfree(head);
 }
 
···
 
 	if (head) {
 		tcf_exts_destroy(&head->exts);
-		tcf_em_tree_destroy(tp, &head->ematches);
+		tcf_em_tree_destroy(&head->ematches);
 		RCU_INIT_POINTER(tp->root, NULL);
 		kfree_rcu(head, rcu);
 	}

net/sched/cls_flow.c

···
 
 	del_timer_sync(&f->perturb_timer);
 	tcf_exts_destroy(&f->exts);
-	tcf_em_tree_destroy(f->tp, &f->ematches);
+	tcf_em_tree_destroy(&f->ematches);
 	kfree(f);
 }
 
···
 	return 0;
 
 err2:
-	tcf_em_tree_destroy(tp, &t);
+	tcf_em_tree_destroy(&t);
 	kfree(fnew);
 err1:
 	tcf_exts_destroy(&e);

net/sched/em_canid.c

···
 	return match;
 }
 
-static int em_canid_change(struct tcf_proto *tp, void *data, int len,
+static int em_canid_change(struct net *net, void *data, int len,
 			  struct tcf_ematch *m)
 {
 	struct can_filter *conf = data; /* Array with rules */
···
 	return 0;
 }
 
-static void em_canid_destroy(struct tcf_proto *tp, struct tcf_ematch *m)
+static void em_canid_destroy(struct tcf_ematch *m)
 {
 	struct canid_match *cm = em_canid_priv(m);
 

net/sched/em_ipset.c

···
 #include <net/ip.h>
 #include <net/pkt_cls.h>
 
-static int em_ipset_change(struct tcf_proto *tp, void *data, int data_len,
+static int em_ipset_change(struct net *net, void *data, int data_len,
 			   struct tcf_ematch *em)
 {
 	struct xt_set_info *set = data;
 	ip_set_id_t index;
-	struct net *net = dev_net(qdisc_dev(tp->q));
 
 	if (data_len != sizeof(*set))
 		return -EINVAL;
···
 	return -ENOMEM;
 }
 
-static void em_ipset_destroy(struct tcf_proto *p, struct tcf_ematch *em)
+static void em_ipset_destroy(struct tcf_ematch *em)
 {
 	const struct xt_set_info *set = (const void *) em->data;
 	if (set) {
-		ip_set_nfnl_put(dev_net(qdisc_dev(p->q)), set->index);
+		ip_set_nfnl_put(em->net, set->index);
 		kfree((void *) em->data);
 	}
 }

net/sched/em_meta.c

···
 	[TCA_EM_META_HDR]	= { .len = sizeof(struct tcf_meta_hdr) },
 };
 
-static int em_meta_change(struct tcf_proto *tp, void *data, int len,
+static int em_meta_change(struct net *net, void *data, int len,
 			  struct tcf_ematch *m)
 {
 	int err;
···
 	return err;
 }
 
-static void em_meta_destroy(struct tcf_proto *tp, struct tcf_ematch *m)
+static void em_meta_destroy(struct tcf_ematch *m)
 {
 	if (m)
 		meta_delete((struct meta_match *) m->data);

net/sched/em_nbyte.c

···
 	char			pattern[0];
 };
 
-static int em_nbyte_change(struct tcf_proto *tp, void *data, int data_len,
+static int em_nbyte_change(struct net *net, void *data, int data_len,
 			   struct tcf_ematch *em)
 {
 	struct tcf_em_nbyte *nbyte = data;

net/sched/em_text.c

···
 	return skb_find_text(skb, from, to, tm->config, &state) != UINT_MAX;
 }
 
-static int em_text_change(struct tcf_proto *tp, void *data, int len,
+static int em_text_change(struct net *net, void *data, int len,
 			  struct tcf_ematch *m)
 {
 	struct text_match *tm;
···
 	return 0;
 }
 
-static void em_text_destroy(struct tcf_proto *tp, struct tcf_ematch *m)
+static void em_text_destroy(struct tcf_ematch *m)
 {
 	if (EM_TEXT_PRIV(m) && EM_TEXT_PRIV(m)->config)
 		textsearch_destroy(EM_TEXT_PRIV(m)->config);

net/sched/ematch.c

···
 	struct tcf_ematch_hdr *em_hdr = nla_data(nla);
 	int data_len = nla_len(nla) - sizeof(*em_hdr);
 	void *data = (void *) em_hdr + sizeof(*em_hdr);
+	struct net *net = dev_net(qdisc_dev(tp->q));
 
 	if (!TCF_EM_REL_VALID(em_hdr->flags))
 		goto errout;
···
 			goto errout;
 
 		if (em->ops->change) {
-			err = em->ops->change(tp, data, data_len, em);
+			err = em->ops->change(net, data, data_len, em);
 			if (err < 0)
 				goto errout;
 		} else if (data_len > 0) {
···
 	em->matchid = em_hdr->matchid;
 	em->flags = em_hdr->flags;
 	em->datalen = data_len;
+	em->net = net;
 
 	err = 0;
 errout:
···
 	return err;
 
 errout_abort:
-	tcf_em_tree_destroy(tp, tree);
+	tcf_em_tree_destroy(tree);
 	return err;
 }
 EXPORT_SYMBOL(tcf_em_tree_validate);
···
  * tcf_em_tree_validate()/tcf_em_tree_change(). You must ensure that
  * the ematch tree is not in use before calling this function.
  */
-void tcf_em_tree_destroy(struct tcf_proto *tp, struct tcf_ematch_tree *tree)
+void tcf_em_tree_destroy(struct tcf_ematch_tree *tree)
 {
 	int i;
 
···
 
 		if (em->ops) {
 			if (em->ops->destroy)
-				em->ops->destroy(tp, em);
+				em->ops->destroy(em);
 			else if (!tcf_em_is_simple(em))
 				kfree((void *) em->data);
 			module_put(em->ops->owner);