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sctp: drop __packed from almost all SCTP structures

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__packed is considered harmful as it potentially generates code that
doesn't perform well and its usage should be avoided as much as
possible.

This patch drops __packed from all SCTP structures except one, which is
sctp_signed_cookie. In there it's required, as per changelog on
commit 9834a2bb49 ("[SCTP]: Fix sctp_cookie alignment in the packet.").

After this patch, no alignment changes neither in x86 or x86_64 and
no exceptions were noticed during testing on both archs.

Code size for SCTP module also didn't change with this patch.

Cc: David Miller <davem@davemloft.net>
Cc: David Laight <David.Laight@ACULAB.COM>
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Marcelo Ricardo Leitner 2017-02-07 11:37:56 -02:00 committed by David S. Miller
parent bb580ad698
commit 85c727b594
2 changed files with 41 additions and 41 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

80
include/linux/sctp.h
View file

@ -62,7 +62,7 @@ typedef struct sctphdr {
__be16 dest;
__be32 vtag;
__le32 checksum;
} __packed sctp_sctphdr_t;
} sctp_sctphdr_t;
static inline struct sctphdr *sctp_hdr(const struct sk_buff *skb)
{
@ -74,7 +74,7 @@ typedef struct sctp_chunkhdr {
__u8 type;
__u8 flags;
__be16 length;
} __packed sctp_chunkhdr_t;
} sctp_chunkhdr_t;
/* Section 3.2. Chunk Type Values.
@ -165,7 +165,7 @@ enum { SCTP_CHUNK_FLAG_T = 0x01 };
typedef struct sctp_paramhdr {
__be16 type;
__be16 length;
} __packed sctp_paramhdr_t;
} sctp_paramhdr_t;
typedef enum {
@ -233,12 +233,12 @@ typedef struct sctp_datahdr {
__be16 ssn;
__be32 ppid;
__u8 payload[0];
} __packed sctp_datahdr_t;
} sctp_datahdr_t;
typedef struct sctp_data_chunk {
sctp_chunkhdr_t chunk_hdr;
sctp_datahdr_t data_hdr;
} __packed sctp_data_chunk_t;
} sctp_data_chunk_t;
/* DATA Chuck Specific Flags */
enum {
@ -264,78 +264,78 @@ typedef struct sctp_inithdr {
__be16 num_inbound_streams;
__be32 initial_tsn;
__u8 params[0];
} __packed sctp_inithdr_t;
} sctp_inithdr_t;
typedef struct sctp_init_chunk {
sctp_chunkhdr_t chunk_hdr;
sctp_inithdr_t init_hdr;
} __packed sctp_init_chunk_t;
} sctp_init_chunk_t;
/* Section 3.3.2.1. IPv4 Address Parameter (5) */
typedef struct sctp_ipv4addr_param {
sctp_paramhdr_t param_hdr;
struct in_addr addr;
} __packed sctp_ipv4addr_param_t;
} sctp_ipv4addr_param_t;
/* Section 3.3.2.1. IPv6 Address Parameter (6) */
typedef struct sctp_ipv6addr_param {
sctp_paramhdr_t param_hdr;
struct in6_addr addr;
} __packed sctp_ipv6addr_param_t;
} sctp_ipv6addr_param_t;
/* Section 3.3.2.1 Cookie Preservative (9) */
typedef struct sctp_cookie_preserve_param {
sctp_paramhdr_t param_hdr;
__be32 lifespan_increment;
} __packed sctp_cookie_preserve_param_t;
} sctp_cookie_preserve_param_t;
/* Section 3.3.2.1 Host Name Address (11) */
typedef struct sctp_hostname_param {
sctp_paramhdr_t param_hdr;
uint8_t hostname[0];
} __packed sctp_hostname_param_t;
} sctp_hostname_param_t;
/* Section 3.3.2.1 Supported Address Types (12) */
typedef struct sctp_supported_addrs_param {
sctp_paramhdr_t param_hdr;
__be16 types[0];
} __packed sctp_supported_addrs_param_t;
} sctp_supported_addrs_param_t;
/* Appendix A. ECN Capable (32768) */
typedef struct sctp_ecn_capable_param {
sctp_paramhdr_t param_hdr;
} __packed sctp_ecn_capable_param_t;
} sctp_ecn_capable_param_t;
/* ADDIP Section 3.2.6 Adaptation Layer Indication */
typedef struct sctp_adaptation_ind_param {
struct sctp_paramhdr param_hdr;
__be32 adaptation_ind;
} __packed sctp_adaptation_ind_param_t;
} sctp_adaptation_ind_param_t;
/* ADDIP Section 4.2.7 Supported Extensions Parameter */
typedef struct sctp_supported_ext_param {
struct sctp_paramhdr param_hdr;
__u8 chunks[0];
} __packed sctp_supported_ext_param_t;
} sctp_supported_ext_param_t;
/* AUTH Section 3.1 Random */
typedef struct sctp_random_param {
sctp_paramhdr_t param_hdr;
__u8 random_val[0];
} __packed sctp_random_param_t;
} sctp_random_param_t;
/* AUTH Section 3.2 Chunk List */
typedef struct sctp_chunks_param {
sctp_paramhdr_t param_hdr;
__u8 chunks[0];
} __packed sctp_chunks_param_t;
} sctp_chunks_param_t;
/* AUTH Section 3.3 HMAC Algorithm */
typedef struct sctp_hmac_algo_param {
sctp_paramhdr_t param_hdr;
__be16 hmac_ids[0];
} __packed sctp_hmac_algo_param_t;
} sctp_hmac_algo_param_t;
/* RFC 2960. Section 3.3.3 Initiation Acknowledgement (INIT ACK) (2):
* The INIT ACK chunk is used to acknowledge the initiation of an SCTP
@ -347,13 +347,13 @@ typedef sctp_init_chunk_t sctp_initack_chunk_t;
typedef struct sctp_cookie_param {
sctp_paramhdr_t p;
__u8 body[0];
} __packed sctp_cookie_param_t;
} sctp_cookie_param_t;
/* Section 3.3.3.1 Unrecognized Parameters (8) */
typedef struct sctp_unrecognized_param {
sctp_paramhdr_t param_hdr;
sctp_paramhdr_t unrecognized;
} __packed sctp_unrecognized_param_t;
} sctp_unrecognized_param_t;
@ -368,7 +368,7 @@ typedef struct sctp_unrecognized_param {
typedef struct sctp_gap_ack_block {
__be16 start;
__be16 end;
} __packed sctp_gap_ack_block_t;
} sctp_gap_ack_block_t;
typedef __be32 sctp_dup_tsn_t;
@ -383,12 +383,12 @@ typedef struct sctp_sackhdr {
__be16 num_gap_ack_blocks;
__be16 num_dup_tsns;
sctp_sack_variable_t variable[0];
} __packed sctp_sackhdr_t;
} sctp_sackhdr_t;
typedef struct sctp_sack_chunk {
sctp_chunkhdr_t chunk_hdr;
sctp_sackhdr_t sack_hdr;
} __packed sctp_sack_chunk_t;
} sctp_sack_chunk_t;
/* RFC 2960. Section 3.3.5 Heartbeat Request (HEARTBEAT) (4):
@ -400,12 +400,12 @@ typedef struct sctp_sack_chunk {
typedef struct sctp_heartbeathdr {
sctp_paramhdr_t info;
} __packed sctp_heartbeathdr_t;
} sctp_heartbeathdr_t;
typedef struct sctp_heartbeat_chunk {
sctp_chunkhdr_t chunk_hdr;
sctp_heartbeathdr_t hb_hdr;
} __packed sctp_heartbeat_chunk_t;
} sctp_heartbeat_chunk_t;
/* For the abort and shutdown ACK we must carry the init tag in the
@ -414,7 +414,7 @@ typedef struct sctp_heartbeat_chunk {
*/
typedef struct sctp_abort_chunk {
sctp_chunkhdr_t uh;
} __packed sctp_abort_chunk_t;
} sctp_abort_chunk_t;
/* For the graceful shutdown we must carry the tag (in common header)
@ -422,12 +422,12 @@ typedef struct sctp_abort_chunk {
*/
typedef struct sctp_shutdownhdr {
__be32 cum_tsn_ack;
} __packed sctp_shutdownhdr_t;
} sctp_shutdownhdr_t;
struct sctp_shutdown_chunk_t {
sctp_chunkhdr_t chunk_hdr;
sctp_shutdownhdr_t shutdown_hdr;
} __packed;
};
/* RFC 2960. Section 3.3.10 Operation Error (ERROR) (9) */
@ -435,12 +435,12 @@ typedef struct sctp_errhdr {
__be16 cause;
__be16 length;
__u8 variable[0];
} __packed sctp_errhdr_t;
} sctp_errhdr_t;
typedef struct sctp_operr_chunk {
sctp_chunkhdr_t chunk_hdr;
sctp_errhdr_t err_hdr;
} __packed sctp_operr_chunk_t;
} sctp_operr_chunk_t;
/* RFC 2960 3.3.10 - Operation Error
*
@ -530,7 +530,7 @@ typedef struct sctp_ecnehdr {
typedef struct sctp_ecne_chunk {
sctp_chunkhdr_t chunk_hdr;
sctp_ecnehdr_t ence_hdr;
} __packed sctp_ecne_chunk_t;
} sctp_ecne_chunk_t;
/* RFC 2960. Appendix A. Explicit Congestion Notification.
* Congestion Window Reduced (CWR) (13)
@ -542,7 +542,7 @@ typedef struct sctp_cwrhdr {
typedef struct sctp_cwr_chunk {
sctp_chunkhdr_t chunk_hdr;
sctp_cwrhdr_t cwr_hdr;
} __packed sctp_cwr_chunk_t;
} sctp_cwr_chunk_t;
/* PR-SCTP
* 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN)
@ -593,17 +593,17 @@ typedef struct sctp_cwr_chunk {
struct sctp_fwdtsn_skip {
__be16 stream;
__be16 ssn;
} __packed;
};
struct sctp_fwdtsn_hdr {
__be32 new_cum_tsn;
struct sctp_fwdtsn_skip skip[0];
} __packed;
};
struct sctp_fwdtsn_chunk {
struct sctp_chunkhdr chunk_hdr;
struct sctp_fwdtsn_hdr fwdtsn_hdr;
} __packed;
};
/* ADDIP
@ -641,17 +641,17 @@ struct sctp_fwdtsn_chunk {
typedef struct sctp_addip_param {
sctp_paramhdr_t param_hdr;
__be32 crr_id;
} __packed sctp_addip_param_t;
} sctp_addip_param_t;
typedef struct sctp_addiphdr {
__be32 serial;
__u8 params[0];
} __packed sctp_addiphdr_t;
} sctp_addiphdr_t;
typedef struct sctp_addip_chunk {
sctp_chunkhdr_t chunk_hdr;
sctp_addiphdr_t addip_hdr;
} __packed sctp_addip_chunk_t;
} sctp_addip_chunk_t;
/* AUTH
* Section 4.1 Authentication Chunk (AUTH)
@ -706,12 +706,12 @@ typedef struct sctp_authhdr {
__be16 shkey_id;
__be16 hmac_id;
__u8 hmac[0];
} __packed sctp_authhdr_t;
} sctp_authhdr_t;
typedef struct sctp_auth_chunk {
sctp_chunkhdr_t chunk_hdr;
sctp_authhdr_t auth_hdr;
} __packed sctp_auth_chunk_t;
} sctp_auth_chunk_t;
struct sctp_infox {
struct sctp_info *sctpinfo;

2
include/net/sctp/structs.h
View file

@ -374,7 +374,7 @@ typedef struct sctp_sender_hb_info {
union sctp_addr daddr;
unsigned long sent_at;
__u64 hb_nonce;
} __packed sctp_sender_hb_info_t;
} sctp_sender_hb_info_t;
struct sctp_stream *sctp_stream_new(__u16 incnt, __u16 outcnt, gfp_t gfp);
void sctp_stream_free(struct sctp_stream *stream);