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sctp: implement sender-side procedures for Add Incoming/Outgoing Streams Request Parameter

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This patch is to implement Sender-Side Procedures for the Add
Outgoing and Incoming Streams Request Parameter described in
rfc6525 section 5.1.5-5.1.6.

It is also to add sockopt SCTP_ADD_STREAMS in rfc6525 section
6.3.4 for users.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2017-02-09 01:18:20 +08:00 committed by David S. Miller
parent 78098117f8
commit 242bd2d519
4 changed files with 115 additions and 0 deletions
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2
include/net/sctp/sctp.h
View File

@ -199,6 +199,8 @@ int sctp_offload_init(void);
int sctp_send_reset_streams(struct sctp_association *asoc,
struct sctp_reset_streams *params);
int sctp_send_reset_assoc(struct sctp_association *asoc);
int sctp_send_add_streams(struct sctp_association *asoc,
struct sctp_add_streams *params);
/*
* Module global variables

7
include/uapi/linux/sctp.h
View File

@ -118,6 +118,7 @@ typedef __s32 sctp_assoc_t;
#define SCTP_ENABLE_STREAM_RESET 118
#define SCTP_RESET_STREAMS 119
#define SCTP_RESET_ASSOC 120
#define SCTP_ADD_STREAMS 121
/* PR-SCTP policies */
#define SCTP_PR_SCTP_NONE 0x0000
@ -1027,4 +1028,10 @@ struct sctp_reset_streams {
uint16_t srs_stream_list[]; /* list if srs_num_streams is not 0 */
};
struct sctp_add_streams {
sctp_assoc_t sas_assoc_id;
uint16_t sas_instrms;
uint16_t sas_outstrms;
};
#endif /* _UAPI_SCTP_H */

29
net/sctp/socket.c
View File

@ -3844,6 +3844,32 @@ out:
return retval;
}
static int sctp_setsockopt_add_streams(struct sock *sk,
char __user *optval,
unsigned int optlen)
{
struct sctp_association *asoc;
struct sctp_add_streams params;
int retval = -EINVAL;
if (optlen != sizeof(params))
goto out;
if (copy_from_user(&params, optval, optlen)) {
retval = -EFAULT;
goto out;
}
asoc = sctp_id2assoc(sk, params.sas_assoc_id);
if (!asoc)
goto out;
retval = sctp_send_add_streams(asoc, &params);
out:
return retval;
}
/* API 6.2 setsockopt(), getsockopt()
*
* Applications use setsockopt() and getsockopt() to set or retrieve
@ -4019,6 +4045,9 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
case SCTP_RESET_ASSOC:
retval = sctp_setsockopt_reset_assoc(sk, optval, optlen);
break;
case SCTP_ADD_STREAMS:
retval = sctp_setsockopt_add_streams(sk, optval, optlen);
break;
default:
retval = -ENOPROTOOPT;
break;

77
net/sctp/stream.c
View File

@ -217,3 +217,80 @@ int sctp_send_reset_assoc(struct sctp_association *asoc)
return 0;
}
int sctp_send_add_streams(struct sctp_association *asoc,
struct sctp_add_streams *params)
{
struct sctp_stream *stream = asoc->stream;
struct sctp_chunk *chunk = NULL;
int retval = -ENOMEM;
__u32 outcnt, incnt;
__u16 out, in;
if (!asoc->peer.reconf_capable ||
!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
retval = -ENOPROTOOPT;
goto out;
}
if (asoc->strreset_outstanding) {
retval = -EINPROGRESS;
goto out;
}
out = params->sas_outstrms;
in = params->sas_instrms;
outcnt = stream->outcnt + out;
incnt = stream->incnt + in;
if (outcnt > SCTP_MAX_STREAM || incnt > SCTP_MAX_STREAM ||
(!out && !in)) {
retval = -EINVAL;
goto out;
}
if (out) {
struct sctp_stream_out *streamout;
streamout = krealloc(stream->out, outcnt * sizeof(*streamout),
GFP_KERNEL);
if (!streamout)
goto out;
memset(streamout + stream->outcnt, 0, out * sizeof(*streamout));
stream->out = streamout;
}
if (in) {
struct sctp_stream_in *streamin;
streamin = krealloc(stream->in, incnt * sizeof(*streamin),
GFP_KERNEL);
if (!streamin)
goto out;
memset(streamin + stream->incnt, 0, in * sizeof(*streamin));
stream->in = streamin;
}
chunk = sctp_make_strreset_addstrm(asoc, out, in);
if (!chunk)
goto out;
asoc->strreset_chunk = chunk;
sctp_chunk_hold(asoc->strreset_chunk);
retval = sctp_send_reconf(asoc, chunk);
if (retval) {
sctp_chunk_put(asoc->strreset_chunk);
asoc->strreset_chunk = NULL;
goto out;
}
stream->incnt = incnt;
stream->outcnt = outcnt;
asoc->strreset_outstanding = !!out + !!in;
out:
return retval;
}