1 files changed, 52 insertions, 2 deletions

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index fbe09a0cccf4..d2f2bdf71ffa 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -911,7 +911,7 @@ struct bpf_prog *bpf_prog_inc(struct bpf_prog *prog)
 EXPORT_SYMBOL_GPL(bpf_prog_inc);
 
 /* prog_idr_lock should have been held */
-static struct bpf_prog *bpf_prog_inc_not_zero(struct bpf_prog *prog)
+struct bpf_prog *bpf_prog_inc_not_zero(struct bpf_prog *prog)
 {
 	int refold;
 
@@ -927,6 +927,7 @@ static struct bpf_prog *bpf_prog_inc_not_zero(struct bpf_prog *prog)
 
 	return prog;
 }
+EXPORT_SYMBOL_GPL(bpf_prog_inc_not_zero);
 
 static struct bpf_prog *__bpf_prog_get(u32 ufd, enum bpf_prog_type *type)
 {
@@ -1086,7 +1087,50 @@ static int bpf_obj_get(const union bpf_attr *attr)
 
 #ifdef CONFIG_CGROUP_BPF
 
-#define BPF_PROG_ATTACH_LAST_FIELD attach_flags
+#define BPF_PROG_ATTACH_LAST_FIELD attach_bpf_fd2
+
+static int sockmap_get_from_fd(const union bpf_attr *attr, int ptype)
+{
+	struct bpf_prog *prog1, *prog2;
+	int ufd = attr->target_fd;
+	struct bpf_map *map;
+	struct fd f;
+	int err;
+
+	f = fdget(ufd);
+	map = __bpf_map_get(f);
+	if (IS_ERR(map))
+		return PTR_ERR(map);
+
+	if (!map->ops->map_attach) {
+		fdput(f);
+		return -EOPNOTSUPP;
+	}
+
+	prog1 = bpf_prog_get_type(attr->attach_bpf_fd, ptype);
+	if (IS_ERR(prog1)) {
+		fdput(f);
+		return PTR_ERR(prog1);
+	}
+
+	prog2 = bpf_prog_get_type(attr->attach_bpf_fd2, ptype);
+	if (IS_ERR(prog2)) {
+		fdput(f);
+		bpf_prog_put(prog1);
+		return PTR_ERR(prog2);
+	}
+
+	err = map->ops->map_attach(map, prog1, prog2);
+	if (err) {
+		fdput(f);
+		bpf_prog_put(prog1);
+		bpf_prog_put(prog2);
+		return PTR_ERR(map);
+	}
+
+	fdput(f);
+	return err;
+}
 
 static int bpf_prog_attach(const union bpf_attr *attr)
 {
@@ -1115,10 +1159,16 @@ static int bpf_prog_attach(const union bpf_attr *attr)
 	case BPF_CGROUP_SOCK_OPS:
 		ptype = BPF_PROG_TYPE_SOCK_OPS;
 		break;
+	case BPF_CGROUP_SMAP_INGRESS:
+		ptype = BPF_PROG_TYPE_SK_SKB;
+		break;
 	default:
 		return -EINVAL;
 	}
 
+	if (attr->attach_type == BPF_CGROUP_SMAP_INGRESS)
+		return sockmap_get_from_fd(attr, ptype);
+
 	prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype);
 	if (IS_ERR(prog))
 		return PTR_ERR(prog);