bpf: extend cgroup bpf core to allow multiple cgroup storage types

In order to introduce per-cpu cgroup storage, let's generalize
bpf cgroup core to support multiple cgroup storage types.
Potentially, per-node cgroup storage can be added later.

This commit is mostly a formal change that replaces
cgroup_storage pointer with a array of cgroup_storage pointers.
It doesn't actually introduce a new storage type,
it will be done later.

Each bpf program is now able to have one cgroup storage of each type.

Signed-off-by: Roman Gushchin <guro@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

1 files changed, 52 insertions, 22 deletions

diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c
index 549f6fbcc461..00f6ed2e4f9a 100644
--- a/kernel/bpf/cgroup.c
+++ b/kernel/bpf/cgroup.c
@@ -25,6 +25,7 @@ EXPORT_SYMBOL(cgroup_bpf_enabled_key);
  */
 void cgroup_bpf_put(struct cgroup *cgrp)
 {
+	enum bpf_cgroup_storage_type stype;
 	unsigned int type;
 
 	for (type = 0; type < ARRAY_SIZE(cgrp->bpf.progs); type++) {
@@ -34,8 +35,10 @@ void cgroup_bpf_put(struct cgroup *cgrp)
 		list_for_each_entry_safe(pl, tmp, progs, node) {
 			list_del(&pl->node);
 			bpf_prog_put(pl->prog);
-			bpf_cgroup_storage_unlink(pl->storage);
-			bpf_cgroup_storage_free(pl->storage);
+			for_each_cgroup_storage_type(stype) {
+				bpf_cgroup_storage_unlink(pl->storage[stype]);
+				bpf_cgroup_storage_free(pl->storage[stype]);
+			}
 			kfree(pl);
 			static_branch_dec(&cgroup_bpf_enabled_key);
 		}
@@ -97,6 +100,7 @@ static int compute_effective_progs(struct cgroup *cgrp,
 				   enum bpf_attach_type type,
 				   struct bpf_prog_array __rcu **array)
 {
+	enum bpf_cgroup_storage_type stype;
 	struct bpf_prog_array *progs;
 	struct bpf_prog_list *pl;
 	struct cgroup *p = cgrp;
@@ -125,7 +129,9 @@ static int compute_effective_progs(struct cgroup *cgrp,
 				continue;
 
 			progs->items[cnt].prog = pl->prog;
-			progs->items[cnt].cgroup_storage = pl->storage;
+			for_each_cgroup_storage_type(stype)
+				progs->items[cnt].cgroup_storage[stype] =
+					pl->storage[stype];
 			cnt++;
 		}
 	} while ((p = cgroup_parent(p)));
@@ -232,7 +238,9 @@ int __cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog,
 {
 	struct list_head *progs = &cgrp->bpf.progs[type];
 	struct bpf_prog *old_prog = NULL;
-	struct bpf_cgroup_storage *storage, *old_storage = NULL;
+	struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE],
+		*old_storage[MAX_BPF_CGROUP_STORAGE_TYPE] = {NULL};
+	enum bpf_cgroup_storage_type stype;
 	struct bpf_prog_list *pl;
 	bool pl_was_allocated;
 	int err;
@@ -254,34 +262,44 @@ int __cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog,
 	if (prog_list_length(progs) >= BPF_CGROUP_MAX_PROGS)
 		return -E2BIG;
 
-	storage = bpf_cgroup_storage_alloc(prog);
-	if (IS_ERR(storage))
-		return -ENOMEM;
+	for_each_cgroup_storage_type(stype) {
+		storage[stype] = bpf_cgroup_storage_alloc(prog, stype);
+		if (IS_ERR(storage[stype])) {
+			storage[stype] = NULL;
+			for_each_cgroup_storage_type(stype)
+				bpf_cgroup_storage_free(storage[stype]);
+			return -ENOMEM;
+		}
+	}
 
 	if (flags & BPF_F_ALLOW_MULTI) {
 		list_for_each_entry(pl, progs, node) {
 			if (pl->prog == prog) {
 				/* disallow attaching the same prog twice */
-				bpf_cgroup_storage_free(storage);
+				for_each_cgroup_storage_type(stype)
+					bpf_cgroup_storage_free(storage[stype]);
 				return -EINVAL;
 			}
 		}
 
 		pl = kmalloc(sizeof(*pl), GFP_KERNEL);
 		if (!pl) {
-			bpf_cgroup_storage_free(storage);
+			for_each_cgroup_storage_type(stype)
+				bpf_cgroup_storage_free(storage[stype]);
 			return -ENOMEM;
 		}
 
 		pl_was_allocated = true;
 		pl->prog = prog;
-		pl->storage = storage;
+		for_each_cgroup_storage_type(stype)
+			pl->storage[stype] = storage[stype];
 		list_add_tail(&pl->node, progs);
 	} else {
 		if (list_empty(progs)) {
 			pl = kmalloc(sizeof(*pl), GFP_KERNEL);
 			if (!pl) {
-				bpf_cgroup_storage_free(storage);
+				for_each_cgroup_storage_type(stype)
+					bpf_cgroup_storage_free(storage[stype]);
 				return -ENOMEM;
 			}
 			pl_was_allocated = true;
@@ -289,12 +307,15 @@ int __cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog,
 		} else {
 			pl = list_first_entry(progs, typeof(*pl), node);
 			old_prog = pl->prog;
-			old_storage = pl->storage;
-			bpf_cgroup_storage_unlink(old_storage);
+			for_each_cgroup_storage_type(stype) {
+				old_storage[stype] = pl->storage[stype];
+				bpf_cgroup_storage_unlink(old_storage[stype]);
+			}
 			pl_was_allocated = false;
 		}
 		pl->prog = prog;
-		pl->storage = storage;
+		for_each_cgroup_storage_type(stype)
+			pl->storage[stype] = storage[stype];
 	}
 
 	cgrp->bpf.flags[type] = flags;
@@ -304,21 +325,27 @@ int __cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog,
 		goto cleanup;
 
 	static_branch_inc(&cgroup_bpf_enabled_key);
-	if (old_storage)
-		bpf_cgroup_storage_free(old_storage);
+	for_each_cgroup_storage_type(stype) {
+		if (!old_storage[stype])
+			continue;
+		bpf_cgroup_storage_free(old_storage[stype]);
+	}
 	if (old_prog) {
 		bpf_prog_put(old_prog);
 		static_branch_dec(&cgroup_bpf_enabled_key);
 	}
-	bpf_cgroup_storage_link(storage, cgrp, type);
+	for_each_cgroup_storage_type(stype)
+		bpf_cgroup_storage_link(storage[stype], cgrp, type);
 	return 0;
 
 cleanup:
 	/* and cleanup the prog list */
 	pl->prog = old_prog;
-	bpf_cgroup_storage_free(pl->storage);
-	pl->storage = old_storage;
-	bpf_cgroup_storage_link(old_storage, cgrp, type);
+	for_each_cgroup_storage_type(stype) {
+		bpf_cgroup_storage_free(pl->storage[stype]);
+		pl->storage[stype] = old_storage[stype];
+		bpf_cgroup_storage_link(old_storage[stype], cgrp, type);
+	}
 	if (pl_was_allocated) {
 		list_del(&pl->node);
 		kfree(pl);
@@ -339,6 +366,7 @@ int __cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog,
 			enum bpf_attach_type type, u32 unused_flags)
 {
 	struct list_head *progs = &cgrp->bpf.progs[type];
+	enum bpf_cgroup_storage_type stype;
 	u32 flags = cgrp->bpf.flags[type];
 	struct bpf_prog *old_prog = NULL;
 	struct bpf_prog_list *pl;
@@ -385,8 +413,10 @@ int __cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog,
 
 	/* now can actually delete it from this cgroup list */
 	list_del(&pl->node);
-	bpf_cgroup_storage_unlink(pl->storage);
-	bpf_cgroup_storage_free(pl->storage);
+	for_each_cgroup_storage_type(stype) {
+		bpf_cgroup_storage_unlink(pl->storage[stype]);
+		bpf_cgroup_storage_free(pl->storage[stype]);
+	}
 	kfree(pl);
 	if (list_empty(progs))
 		/* last program was detached, reset flags to zero */