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sctp: add stream interleave enable members and sockopt

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This patch adds intl_enable in asoc and netns, and strm_interleave in
sctp_sock to indicate if stream interleave is enabled and supported.

netns intl_enable would be set via procfs, but that is not added yet
until all stream interleave codes are completely implemented; asoc
intl_enable will be set when doing 4-shakehands.

sp strm_interleave can be set by sockopt SCTP_INTERLEAVING_SUPPORTED
which is also added in this patch. This socket option is defined in
section 4.3.1 of RFC8260.

Note that strm_interleave can only be set by sockopt when both netns
intl_enable and sp frag_interleave are set.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2017-12-08 21:03:58 +08:00 committed by David S. Miller
parent 92ff426450
commit 772a58693f
4 changed files with 94 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/net/netns/sctp.h
View File

@ -122,9 +122,12 @@ struct netns_sctp {
/* Flag to indicate if PR-CONFIG is enabled. */
int reconf_enable;
/* Flag to idicate if SCTP-AUTH is enabled */
/* Flag to indicate if SCTP-AUTH is enabled */
int auth_enable;
/* Flag to indicate if stream interleave is enabled */
int intl_enable;
/*
* Policy to control SCTP IPv4 address scoping
* 0 - Disable IPv4 address scoping

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

@ -217,6 +217,7 @@ struct sctp_sock {
disable_fragments:1,
v4mapped:1,
frag_interleave:1,
strm_interleave:1,
recvrcvinfo:1,
recvnxtinfo:1,
data_ready_signalled:1;
@ -1940,6 +1941,7 @@ struct sctp_association {
__u8 need_ecne:1, /* Need to send an ECNE Chunk? */
temp:1, /* Is it a temporary association? */
force_delay:1,
intl_enable:1,
prsctp_enable:1,
reconf_enable:1;

1
include/uapi/linux/sctp.h
View File

@ -125,6 +125,7 @@ typedef __s32 sctp_assoc_t;
#define SCTP_SOCKOPT_PEELOFF_FLAGS 122
#define SCTP_STREAM_SCHEDULER 123
#define SCTP_STREAM_SCHEDULER_VALUE 124
#define SCTP_INTERLEAVING_SUPPORTED 125
/* PR-SCTP policies */
#define SCTP_PR_SCTP_NONE 0x0000

88
net/sctp/socket.c
View File

@ -3350,7 +3350,10 @@ static int sctp_setsockopt_fragment_interleave(struct sock *sk,
if (get_user(val, (int __user *)optval))
return -EFAULT;
sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
sctp_sk(sk)->frag_interleave = !!val;
if (!sctp_sk(sk)->frag_interleave)
sctp_sk(sk)->strm_interleave = 0;
return 0;
}
@ -4019,6 +4022,40 @@ out:
return retval;
}
static int sctp_setsockopt_interleaving_supported(struct sock *sk,
char __user *optval,
unsigned int optlen)
{
struct sctp_sock *sp = sctp_sk(sk);
struct net *net = sock_net(sk);
struct sctp_assoc_value params;
int retval = -EINVAL;
if (optlen < sizeof(params))
goto out;
optlen = sizeof(params);
if (copy_from_user(&params, optval, optlen)) {
retval = -EFAULT;
goto out;
}
if (params.assoc_id)
goto out;
if (!net->sctp.intl_enable || !sp->frag_interleave) {
retval = -EPERM;
goto out;
}
sp->strm_interleave = !!params.assoc_value;
retval = 0;
out:
return retval;
}
/* API 6.2 setsockopt(), getsockopt()
*
* Applications use setsockopt() and getsockopt() to set or retrieve
@ -4206,6 +4243,10 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
case SCTP_STREAM_SCHEDULER_VALUE:
retval = sctp_setsockopt_scheduler_value(sk, optval, optlen);
break;
case SCTP_INTERLEAVING_SUPPORTED:
retval = sctp_setsockopt_interleaving_supported(sk, optval,
optlen);
break;
default:
retval = -ENOPROTOOPT;
break;
@ -6969,6 +7010,47 @@ out:
return retval;
}
static int sctp_getsockopt_interleaving_supported(struct sock *sk, int len,
char __user *optval,
int __user *optlen)
{
struct sctp_assoc_value params;
struct sctp_association *asoc;
int retval = -EFAULT;
if (len < sizeof(params)) {
retval = -EINVAL;
goto out;
}
len = sizeof(params);
if (copy_from_user(&params, optval, len))
goto out;
asoc = sctp_id2assoc(sk, params.assoc_id);
if (asoc) {
params.assoc_value = asoc->intl_enable;
} else if (!params.assoc_id) {
struct sctp_sock *sp = sctp_sk(sk);
params.assoc_value = sp->strm_interleave;
} else {
retval = -EINVAL;
goto out;
}
if (put_user(len, optlen))
goto out;
if (copy_to_user(optval, &params, len))
goto out;
retval = 0;
out:
return retval;
}
static int sctp_getsockopt(struct sock *sk, int level, int optname,
char __user *optval, int __user *optlen)
{
@ -7159,6 +7241,10 @@ static int sctp_getsockopt(struct sock *sk, int level, int optname,
retval = sctp_getsockopt_scheduler_value(sk, len, optval,
optlen);
break;
case SCTP_INTERLEAVING_SUPPORTED:
retval = sctp_getsockopt_interleaving_supported(sk, len, optval,
optlen);
break;
default:
retval = -ENOPROTOOPT;
break;