[PATCH net-next v3] net, uapi: remove inclusion of arpa/inet.h

From: Nick Desaulniers
Date: Mon Apr 04 2022 - 18:01:50 EST


In include/uapi/linux/tipc_config.h, there's a comment that it includes
arpa/inet.h for ntohs; but ntohs is not defined in any UAPI header. For
now, reuse the definitions from include/linux/byteorder/generic.h, since
the various conversion functions do exist in UAPI headers:
include/uapi/linux/byteorder/big_endian.h
include/uapi/linux/byteorder/little_endian.h

We would like to get to the point where we can build UAPI header tests
with -nostdinc, meaning that kernel UAPI headers should not have a
circular dependency on libc headers.

Link: https://android-review.googlesource.com/c/platform/bionic/+/2048127
Suggested-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
---
Changes V2 -> V3:
* Use __be16_to_cpu and friends directly.
* Rebase on net-next now that the merge window is closed.
* Cut down commit message.
Changes V1 -> V2:
* Fix broken patch.

include/uapi/linux/tipc_config.h | 28 ++++++++++++----------------
1 file changed, 12 insertions(+), 16 deletions(-)

diff --git a/include/uapi/linux/tipc_config.h b/include/uapi/linux/tipc_config.h
index 4dfc05651c98..c00adf2fe868 100644
--- a/include/uapi/linux/tipc_config.h
+++ b/include/uapi/linux/tipc_config.h
@@ -43,10 +43,6 @@
#include <linux/tipc.h>
#include <asm/byteorder.h>

-#ifndef __KERNEL__
-#include <arpa/inet.h> /* for ntohs etc. */
-#endif
-
/*
* Configuration
*
@@ -269,33 +265,33 @@ static inline int TLV_OK(const void *tlv, __u16 space)
*/

return (space >= TLV_SPACE(0)) &&
- (ntohs(((struct tlv_desc *)tlv)->tlv_len) <= space);
+ (__be16_to_cpu(((struct tlv_desc *)tlv)->tlv_len) <= space);
}

static inline int TLV_CHECK(const void *tlv, __u16 space, __u16 exp_type)
{
return TLV_OK(tlv, space) &&
- (ntohs(((struct tlv_desc *)tlv)->tlv_type) == exp_type);
+ (__be16_to_cpu(((struct tlv_desc *)tlv)->tlv_type) == exp_type);
}

static inline int TLV_GET_LEN(struct tlv_desc *tlv)
{
- return ntohs(tlv->tlv_len);
+ return __be16_to_cpu(tlv->tlv_len);
}

static inline void TLV_SET_LEN(struct tlv_desc *tlv, __u16 len)
{
- tlv->tlv_len = htons(len);
+ tlv->tlv_len = __cpu_to_be16(len);
}

static inline int TLV_CHECK_TYPE(struct tlv_desc *tlv, __u16 type)
{
- return (ntohs(tlv->tlv_type) == type);
+ return (__be16_to_cpu(tlv->tlv_type) == type);
}

static inline void TLV_SET_TYPE(struct tlv_desc *tlv, __u16 type)
{
- tlv->tlv_type = htons(type);
+ tlv->tlv_type = __cpu_to_be16(type);
}

static inline int TLV_SET(void *tlv, __u16 type, void *data, __u16 len)
@@ -305,8 +301,8 @@ static inline int TLV_SET(void *tlv, __u16 type, void *data, __u16 len)

tlv_len = TLV_LENGTH(len);
tlv_ptr = (struct tlv_desc *)tlv;
- tlv_ptr->tlv_type = htons(type);
- tlv_ptr->tlv_len = htons(tlv_len);
+ tlv_ptr->tlv_type = __cpu_to_be16(type);
+ tlv_ptr->tlv_len = __cpu_to_be16(tlv_len);
if (len && data) {
memcpy(TLV_DATA(tlv_ptr), data, len);
memset((char *)TLV_DATA(tlv_ptr) + len, 0, TLV_SPACE(len) - tlv_len);
@@ -348,7 +344,7 @@ static inline void *TLV_LIST_DATA(struct tlv_list_desc *list)

static inline void TLV_LIST_STEP(struct tlv_list_desc *list)
{
- __u16 tlv_space = TLV_ALIGN(ntohs(list->tlv_ptr->tlv_len));
+ __u16 tlv_space = TLV_ALIGN(__be16_to_cpu(list->tlv_ptr->tlv_len));

list->tlv_ptr = (struct tlv_desc *)((char *)list->tlv_ptr + tlv_space);
list->tlv_space -= tlv_space;
@@ -404,9 +400,9 @@ static inline int TCM_SET(void *msg, __u16 cmd, __u16 flags,

msg_len = TCM_LENGTH(data_len);
tcm_hdr = (struct tipc_cfg_msg_hdr *)msg;
- tcm_hdr->tcm_len = htonl(msg_len);
- tcm_hdr->tcm_type = htons(cmd);
- tcm_hdr->tcm_flags = htons(flags);
+ tcm_hdr->tcm_len = __cpu_to_be32(msg_len);
+ tcm_hdr->tcm_type = __cpu_to_be16(cmd);
+ tcm_hdr->tcm_flags = __cpu_to_be16(flags);
if (data_len && data) {
memcpy(TCM_DATA(msg), data, data_len);
memset((char *)TCM_DATA(msg) + data_len, 0, TCM_SPACE(data_len) - msg_len);
--
2.35.1.1094.g7c7d902a7c-goog