streams tpi options mgmt question

[Matt Benjamin]

Hi List,

I'm trying to set the T_SCTP_SID option using the TPI interface
(streams-0.9.2.3, strxnet-0.9.2.11, strsctp-0.9.2.8), and I'm getting
TBADOPT.

I'm sure the problem is obvious, but I haven't been able to deduce it
after much staring.

Here's a snippet of code--fd is opened on /dev/sctp_t, bound, and
connected (received T_CONN_CON):

typedef struct tpi_scalar_option {
struct t_opthdr opt_hdr;
t_scalar_t opt_val;
} tpi_scalar_option;

int
set_stream_id(int fd, t_scalar_t stream_id)
{
struct {
struct T_optmgmt_req msg_hdr;
struct tpi_scalar_option opt;
} opt_req;

struct {
struct T_optmgmt_ack msg_hdr;
struct tpi_scalar_option opt;
} opt_ack;

int code, flags;
struct T_error_ack *error_ack;
struct strbuf ctlbuf;

opt_req.opt.opt_hdr.len = sizeof(opt_req.opt.opt_val);
opt_req.opt.opt_hdr.level = T_INET_SCTP;
opt_req.opt.opt_hdr.name = T_SCTP_SID;
opt_req.opt.opt_val = stream_id;

opt_req.msg_hdr.PRIM_type = T_OPTMGMT_REQ;
opt_req.msg_hdr.OPT_length = sizeof(opt_req.opt);
opt_req.msg_hdr.OPT_offset = sizeof(opt_req.msg_hdr);
opt_req.msg_hdr.MGMT_flags = T_NEGOTIATE;

ctlbuf.len = sizeof(opt_req);
ctlbuf.buf = (char*) &opt_req;
code = putmsg(fd, &ctlbuf, NULL, 0);

ctlbuf.maxlen = sizeof(opt_ack);
ctlbuf.len = 0;
ctlbuf.buf = (char*) &opt_ack;
flags = 0;
code = getmsg(fd, &ctlbuf, NULL, &flags);

/* ack is error, TBADOPT */
}

Any pointers (or something) appreciated.

Thanks,

Matt

- --

Matt Benjamin

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[Brian F. G. Bidulock]

Matt,

Post by Matt Benjamin
opt_req.opt.opt_hdr.len = sizeof(opt_req.opt.opt_val);

the above line is incorrect, try:

opt_req.opt.opt_hdr.len = sizeof(opt_req.opt);

because len must be the length of header and the option value, not just the
length of the option value (see "OPTIONS" under man 3 t_optmgmt).

-- brian