Bpf file read

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@@ -4648,6 +4648,7 @@ F:	Documentation/userspace-api/ebpf/
 F:	arch/*/net/*
 F:	include/linux/bpf*
 F:	include/linux/btf*
+F:	include/linux/buildid.h
 F:	include/linux/filter.h
 F:	include/trace/events/xdp.h
 F:	include/uapi/linux/bpf*

include/linux/bpf.h

@@ -670,6 +670,9 @@ static inline bool bpf_map_has_internal_structs(struct bpf_map *map)
 
 void bpf_map_free_internal_structs(struct bpf_map *map, void *obj);
 
+int bpf_dynptr_from_file_sleepable(struct file *file, u32 flags,
+				   struct bpf_dynptr *ptr__uninit);
+
 extern const struct bpf_map_ops bpf_map_offload_ops;
 
 /* bpf_type_flag contains a set of flags that are applicable to the values of
@@ -792,12 +795,15 @@ enum bpf_type_flag {
 	/* DYNPTR points to skb_metadata_end()-skb_metadata_len() */
 	DYNPTR_TYPE_SKB_META	= BIT(19 + BPF_BASE_TYPE_BITS),
 
+	/* DYNPTR points to file */
+	DYNPTR_TYPE_FILE	= BIT(20 + BPF_BASE_TYPE_BITS),
+
 	__BPF_TYPE_FLAG_MAX,
 	__BPF_TYPE_LAST_FLAG	= __BPF_TYPE_FLAG_MAX - 1,
 };
 
 #define DYNPTR_TYPE_FLAG_MASK	(DYNPTR_TYPE_LOCAL | DYNPTR_TYPE_RINGBUF | DYNPTR_TYPE_SKB \
-				 | DYNPTR_TYPE_XDP | DYNPTR_TYPE_SKB_META)
+				 | DYNPTR_TYPE_XDP | DYNPTR_TYPE_SKB_META | DYNPTR_TYPE_FILE)
 
 /* Max number of base types. */
 #define BPF_BASE_TYPE_LIMIT	(1UL << BPF_BASE_TYPE_BITS)
@@ -1385,21 +1391,23 @@ enum bpf_dynptr_type {
 	BPF_DYNPTR_TYPE_XDP,
 	/* Points to skb_metadata_end()-skb_metadata_len() */
 	BPF_DYNPTR_TYPE_SKB_META,
+	/* Underlying data is a file */
+	BPF_DYNPTR_TYPE_FILE,
 };
 
-int bpf_dynptr_check_size(u32 size);
-u32 __bpf_dynptr_size(const struct bpf_dynptr_kern *ptr);
-const void *__bpf_dynptr_data(const struct bpf_dynptr_kern *ptr, u32 len);
-void *__bpf_dynptr_data_rw(const struct bpf_dynptr_kern *ptr, u32 len);
+int bpf_dynptr_check_size(u64 size);
+u64 __bpf_dynptr_size(const struct bpf_dynptr_kern *ptr);
+const void *__bpf_dynptr_data(const struct bpf_dynptr_kern *ptr, u64 len);
+void *__bpf_dynptr_data_rw(const struct bpf_dynptr_kern *ptr, u64 len);
 bool __bpf_dynptr_is_rdonly(const struct bpf_dynptr_kern *ptr);
-int __bpf_dynptr_write(const struct bpf_dynptr_kern *dst, u32 offset,
-		       void *src, u32 len, u64 flags);
-void *bpf_dynptr_slice_rdwr(const struct bpf_dynptr *p, u32 offset,
-			    void *buffer__opt, u32 buffer__szk);
+int __bpf_dynptr_write(const struct bpf_dynptr_kern *dst, u64 offset,
+		       void *src, u64 len, u64 flags);
+void *bpf_dynptr_slice_rdwr(const struct bpf_dynptr *p, u64 offset,
+			    void *buffer__opt, u64 buffer__szk);
 
-static inline int bpf_dynptr_check_off_len(const struct bpf_dynptr_kern *ptr, u32 offset, u32 len)
+static inline int bpf_dynptr_check_off_len(const struct bpf_dynptr_kern *ptr, u64 offset, u64 len)
 {
-	u32 size = __bpf_dynptr_size(ptr);
+	u64 size = __bpf_dynptr_size(ptr);
 
 	if (len > size || offset > size - len)
 		return -E2BIG;

include/linux/buildid.h

@@ -18,4 +18,29 @@ void init_vmlinux_build_id(void);
 static inline void init_vmlinux_build_id(void) { }
 #endif
 
+struct freader {
+	void *buf;
+	u32 buf_sz;
+	int err;
+	union {
+		struct {
+			struct file *file;
+			struct folio *folio;
+			void *addr;
+			loff_t folio_off;
+			bool may_fault;
+		};
+		struct {
+			const char *data;
+			u64 data_sz;
+		};
+	};
+};
+
+void freader_init_from_file(struct freader *r, void *buf, u32 buf_sz,
+			    struct file *file, bool may_fault);
+void freader_init_from_mem(struct freader *r, const char *data, u64 data_sz);
+const void *freader_fetch(struct freader *r, loff_t file_off, size_t sz);
+void freader_cleanup(struct freader *r);
+
 #endif

include/uapi/linux/bpf.h

@@ -5618,7 +5618,7 @@ union bpf_attr {
  *	Return
  *		*sk* if casting is valid, or **NULL** otherwise.
  *
- * long bpf_dynptr_from_mem(void *data, u32 size, u64 flags, struct bpf_dynptr *ptr)
+ * long bpf_dynptr_from_mem(void *data, u64 size, u64 flags, struct bpf_dynptr *ptr)
  *	Description
  *		Get a dynptr to local memory *data*.
  *
@@ -5661,7 +5661,7 @@ union bpf_attr {
  *	Return
  *		Nothing. Always succeeds.
  *
- * long bpf_dynptr_read(void *dst, u32 len, const struct bpf_dynptr *src, u32 offset, u64 flags)
+ * long bpf_dynptr_read(void *dst, u64 len, const struct bpf_dynptr *src, u64 offset, u64 flags)
  *	Description
  *		Read *len* bytes from *src* into *dst*, starting from *offset*
  *		into *src*.
@@ -5671,7 +5671,7 @@ union bpf_attr {
  *		of *src*'s data, -EINVAL if *src* is an invalid dynptr or if
  *		*flags* is not 0.
  *
- * long bpf_dynptr_write(const struct bpf_dynptr *dst, u32 offset, void *src, u32 len, u64 flags)
+ * long bpf_dynptr_write(const struct bpf_dynptr *dst, u64 offset, void *src, u64 len, u64 flags)
  *	Description
  *		Write *len* bytes from *src* into *dst*, starting from *offset*
  *		into *dst*.
@@ -5692,7 +5692,7 @@ union bpf_attr {
  *		is a read-only dynptr or if *flags* is not correct. For skb-type dynptrs,
  *		other errors correspond to errors returned by **bpf_skb_store_bytes**\ ().
  *
- * void *bpf_dynptr_data(const struct bpf_dynptr *ptr, u32 offset, u32 len)
+ * void *bpf_dynptr_data(const struct bpf_dynptr *ptr, u64 offset, u64 len)
  *	Description
  *		Get a pointer to the underlying dynptr data.
  *