On Fri, Jan 20, 2017 at 5:47 AM, Marcelo Ricardo Leitner
<marcelo.leitner@xxxxxxxxx> wrote:
> On Fri, Jan 20, 2017 at 01:19:14AM +0800, Xin Long wrote:
>> 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@xxxxxxxxx>
>> ---
>> include/net/sctp/sctp.h | 2 +
>> include/uapi/linux/sctp.h | 7 ++++
>> net/sctp/socket.c | 29 ++++++++++++++
>> net/sctp/stream.c | 99 +++++++++++++++++++++++++++++++++++++++++++++++
>> 4 files changed, 137 insertions(+)
>>
>> diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h
>> index b93820f..68ee1a6 100644
>> --- a/include/net/sctp/sctp.h
>> +++ b/include/net/sctp/sctp.h
>> @@ -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
>> diff --git a/include/uapi/linux/sctp.h b/include/uapi/linux/sctp.h
>> index c0bd8c3..a91a9cc 100644
>> --- a/include/uapi/linux/sctp.h
>> +++ b/include/uapi/linux/sctp.h
>> @@ -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 */
>> diff --git a/net/sctp/socket.c b/net/sctp/socket.c
>> index 2c5c9ca..ae0a99e 100644
>> --- a/net/sctp/socket.c
>> +++ b/net/sctp/socket.c
>> @@ -3838,6 +3838,32 @@ static int sctp_setsockopt_reset_assoc(struct sock *sk,
>> 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(¶ms, optval, optlen)) {
>> + retval = -EFAULT;
>> + goto out;
>> + }
>> +
>> + asoc = sctp_id2assoc(sk, params.sas_assoc_id);
>> + if (!asoc)
>> + goto out;
>> +
>> + retval = sctp_send_add_streams(asoc, ¶ms);
>> +
>> +out:
>> + return retval;
>> +}
>> +
>> /* API 6.2 setsockopt(), getsockopt()
>> *
>> * Applications use setsockopt() and getsockopt() to set or retrieve
>> @@ -4013,6 +4039,9 @@ 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;
>> diff --git a/net/sctp/stream.c b/net/sctp/stream.c
>> index b368191..ba41837 100644
>> --- a/net/sctp/stream.c
>> +++ b/net/sctp/stream.c
>> @@ -195,3 +195,102 @@ int sctp_send_reset_assoc(struct sctp_association *asoc)
>>
>> return retval;
>> }
>> +
>> +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 = -EINVAL;
>> + __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;
>> +
>> + if (!out && !in)
>
> [@]
>
>> + goto out;
>> +
>> + if (out) {
>> + __u16 nums = stream->outcnt + out;
>> +
>> + /* Check for overflow, can't use nums here */
>> + if (stream->outcnt + out > SCTP_MAX_STREAM)
>> + goto out;
>
> You should do these overflow checks before doing actual work,
> preferreably at [@] mark above.
> Here it's fine, but when [*] below run, it may be too late.
>
>> +
>> + /* Use ksize to check if stream array really needs to realloc */
>> + if (ksize(stream->out) / sizeof(*stream->out) < nums) {
>> + struct sctp_stream_out *streamout;
>> +
>> + streamout = kcalloc(nums, sizeof(*streamout),
>> + GFP_KERNEL);
>> + if (!streamout) {
>> + retval = -ENOMEM;
>> + goto out;
>> + }
>> +
>> + memcpy(streamout, stream->out,
>> + sizeof(*streamout) * stream->outcnt);
>> +
>> + kfree(stream->out);
>> + stream->out = streamout;
>> + }
>> +
>> + stream->outcnt = nums;
>> + }
>> +
>> + if (in) {
>> + __u16 nums = stream->incnt + in;
>> +
>> + if (stream->incnt + in > SCTP_MAX_STREAM)
>> + goto out;
>
> [*]
it will cause alloc unused memory, but no consistent issue if
we move outcnt/incnt after checking retval.
if we want overflow check to go ahead of the actual work, another
conditions if (in) {} if(out) {} have to be added.
>
>> +
>> + if (ksize(stream->in) / sizeof(*stream->in) < nums) {
>> + struct sctp_stream_in *streamin;
>> +
>> + streamin = kcalloc(nums, sizeof(*streamin),
>> + GFP_KERNEL);
>> + if (!streamin) {
>> + retval = -ENOMEM;
>> + goto out;
>> + }
>> +
>> + memcpy(streamin, stream->in,
>> + sizeof(*streamin) * stream->incnt);
>> +
>> + kfree(stream->in);
>> + stream->in = streamin;
>> + }
>> +
>> + stream->incnt = nums;
>> + }
>> +
>> + chunk = sctp_make_strreset_addstrm(asoc, out, in);
>> + if (!chunk) {
>> + retval = -ENOMEM;
>> + goto out;
>> + }
>> +
>> + asoc->strreset_outstanding = !!out + !!in;
>> + 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;
>> + }
>> +
>> +out:
>> + return retval;
>> +}
>> --
>> 2.1.0
>>
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