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Subject[PATCH] net/sctp: fix GCC8+ -Wpacked-not-aligned warnings
Date
There are a lot of those warnings with GCC8+ 64bit,

In file included from ./include/linux/sctp.h:42,
from net/core/skbuff.c:47:
./include/uapi/linux/sctp.h:395:1: warning: alignment 4 of 'struct
sctp_paddr_change' is less than 8 [-Wpacked-not-aligned]
} __attribute__((packed, aligned(4)));
^
./include/uapi/linux/sctp.h:728:1: warning: alignment 4 of 'struct
sctp_setpeerprim' is less than 8 [-Wpacked-not-aligned]
} __attribute__((packed, aligned(4)));
^
./include/uapi/linux/sctp.h:727:26: warning: 'sspp_addr' offset 4 in
'struct sctp_setpeerprim' isn't aligned to 8 [-Wpacked-not-aligned]
struct sockaddr_storage sspp_addr;
^~~~~~~~~
./include/uapi/linux/sctp.h:741:1: warning: alignment 4 of 'struct
sctp_prim' is less than 8 [-Wpacked-not-aligned]
} __attribute__((packed, aligned(4)));
^
./include/uapi/linux/sctp.h:740:26: warning: 'ssp_addr' offset 4 in
'struct sctp_prim' isn't aligned to 8 [-Wpacked-not-aligned]
struct sockaddr_storage ssp_addr;
^~~~~~~~
./include/uapi/linux/sctp.h:792:1: warning: alignment 4 of 'struct
sctp_paddrparams' is less than 8 [-Wpacked-not-aligned]
} __attribute__((packed, aligned(4)));
^
./include/uapi/linux/sctp.h:784:26: warning: 'spp_address' offset 4 in
'struct sctp_paddrparams' isn't aligned to 8 [-Wpacked-not-aligned]
struct sockaddr_storage spp_address;
^~~~~~~~~~~
./include/uapi/linux/sctp.h:905:1: warning: alignment 4 of 'struct
sctp_paddrinfo' is less than 8 [-Wpacked-not-aligned]
} __attribute__((packed, aligned(4)));
^
./include/uapi/linux/sctp.h:899:26: warning: 'spinfo_address' offset 4
in 'struct sctp_paddrinfo' isn't aligned to 8 [-Wpacked-not-aligned]
struct sockaddr_storage spinfo_address;
^~~~~~~~~~~~~~
Fix them by aligning the structures and fields to 8 bytes instead.

Signed-off-by: Qian Cai <cai@lca.pw>
---
include/uapi/linux/sctp.h | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/include/uapi/linux/sctp.h b/include/uapi/linux/sctp.h
index b8f2c4d56532..e7bd71cde882 100644
--- a/include/uapi/linux/sctp.h
+++ b/include/uapi/linux/sctp.h
@@ -392,7 +392,7 @@ struct sctp_paddr_change {
int spc_state;
int spc_error;
sctp_assoc_t spc_assoc_id;
-} __attribute__((packed, aligned(4)));
+} __attribute__((packed, aligned(8)));

/*
* spc_state: 32 bits (signed integer)
@@ -724,8 +724,8 @@ struct sctp_assocparams {
*/
struct sctp_setpeerprim {
sctp_assoc_t sspp_assoc_id;
- struct sockaddr_storage sspp_addr;
-} __attribute__((packed, aligned(4)));
+ struct sockaddr_storage sspp_addr __attribute__((aligned(8)));
+} __attribute__((packed, aligned(8)));

/*
* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
@@ -737,8 +737,8 @@ struct sctp_setpeerprim {
*/
struct sctp_prim {
sctp_assoc_t ssp_assoc_id;
- struct sockaddr_storage ssp_addr;
-} __attribute__((packed, aligned(4)));
+ struct sockaddr_storage ssp_addr __attribute__((aligned(8)));
+} __attribute__((packed, aligned(8)));

/* For backward compatibility use, define the old name too */
#define sctp_setprim sctp_prim
@@ -781,7 +781,7 @@ enum sctp_spp_flags {

struct sctp_paddrparams {
sctp_assoc_t spp_assoc_id;
- struct sockaddr_storage spp_address;
+ struct sockaddr_storage spp_address __attribute__((aligned(8)));
__u32 spp_hbinterval;
__u16 spp_pathmaxrxt;
__u32 spp_pathmtu;
@@ -789,7 +789,7 @@ struct sctp_paddrparams {
__u32 spp_flags;
__u32 spp_ipv6_flowlabel;
__u8 spp_dscp;
-} __attribute__((packed, aligned(4)));
+} __attribute__((packed, aligned(8)));

/*
* 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
@@ -896,13 +896,13 @@ struct sctp_stream_value {
*/
struct sctp_paddrinfo {
sctp_assoc_t spinfo_assoc_id;
- struct sockaddr_storage spinfo_address;
+ struct sockaddr_storage spinfo_address __attribute__((aligned(8)));
__s32 spinfo_state;
__u32 spinfo_cwnd;
__u32 spinfo_srtt;
__u32 spinfo_rto;
__u32 spinfo_mtu;
-} __attribute__((packed, aligned(4)));
+} __attribute__((packed, aligned(8)));

/* Peer addresses's state. */
/* UNKNOWN: Peer address passed by the upper layer in sendmsg or connect[x]
--
1.8.3.1
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