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m3ua: Implement link bring-up and sending/receiving of data

the opc/dpc for ISUP is currently wrong. The send/recv path
for actual SCCP data is not tested.
This commit is contained in:
Holger Hans Peter Freyther 2015-03-24 18:51:02 +01:00
parent 6a20bae1f9
commit d1df399a97
2 changed files with 346 additions and 2 deletions

View File

@ -22,6 +22,11 @@ struct mtp_m3ua_client_link {
struct sockaddr_in remote;
int link_index;
int routing_context;
/* state of the link */
int aspsm_active;
int asptm_active;
};
struct mtp_m3ua_client_link *mtp_m3ua_client_link_init(struct mtp_link *link);

View File

@ -18,6 +18,11 @@
#include <sctp_m3ua.h>
#include <cellmgr_debug.h>
#include <string.h>
#include <bsc_data.h>
#include <mtp_level3.h>
#include <osmocom/sigtran/xua_msg.h>
#include <osmocom/sigtran/m3ua_types.h>
#include <osmocom/core/talloc.h>
@ -30,6 +35,20 @@
#define notImplemented() \
LOGP(DINP, LOGL_NOTICE, "%s not implemented.\n", __func__)
/*
* State machine code
*/
static void m3ua_handle_aspsm(struct mtp_m3ua_client_link *link, struct xua_msg *msg);
static void m3ua_handle_asptm(struct mtp_m3ua_client_link *link, struct xua_msg *msg);
static void m3ua_handle_trans(struct mtp_m3ua_client_link *link, struct xua_msg *msg);
static void m3ua_send_daud(struct mtp_m3ua_client_link *link, uint32_t pc);
static void m3ua_send_aspup(struct mtp_m3ua_client_link *link);
static void m3ua_send_aspac(struct mtp_m3ua_client_link *link);
/*
* boilerplate
*/
static int m3ua_shutdown(struct mtp_link *mtp_link);
static void m3ua_start(void *data);
@ -51,7 +70,30 @@ static void fail_link(struct mtp_m3ua_client_link *link)
static int m3ua_conn_handle(struct mtp_m3ua_client_link *link,
struct msgb *msg, struct sctp_sndrcvinfo *info)
{
notImplemented();
struct xua_msg *m3ua;
m3ua = xua_from_msg(M3UA_VERSION, msg->len, msg->data);
if (!m3ua) {
LOGP(DINP, LOGL_ERROR, "Failed to parse the message.\n");
return -1;
}
switch (m3ua->hdr.msg_class) {
case M3UA_CLS_ASPSM:
m3ua_handle_aspsm(link, m3ua);
break;
case M3UA_CLS_ASPTM:
m3ua_handle_asptm(link, m3ua);
break;
case M3UA_CLS_TRANS:
m3ua_handle_trans(link, m3ua);
break;
default:
LOGP(DINP, LOGL_ERROR, "Unhandled msg_class %d\n",
m3ua->hdr.msg_class);
break;
}
xua_msg_free(m3ua);
return 0;
}
@ -70,6 +112,29 @@ static int m3ua_conn_write(struct osmo_fd *fd, struct msgb *msg)
return 0;
}
static int m3ua_conn_send(struct mtp_m3ua_client_link *link,
struct xua_msg *m3ua,
struct sctp_sndrcvinfo *info)
{
struct msgb *msg;
msg = xua_to_msg(M3UA_VERSION, m3ua);
if (!msg)
return -1;
/* save the OOB data in front of the message */
msg->l2h = msg->data;
msgb_push(msg, sizeof(*info));
memcpy(msg->data, info, sizeof(*info));
if (osmo_wqueue_enqueue(&link->queue, msg) != 0) {
LOGP(DINP, LOGL_ERROR, "Failed to enqueue.\n");
msgb_free(msg);
return -1;
}
return 0;
}
static int m3ua_conn_read(struct osmo_fd *fd)
{
struct sockaddr_in addr;
@ -161,11 +226,89 @@ static void m3ua_start(void *data)
close(sctp);
return fail_link(link);
}
/* begin the messages for bring-up */
m3ua_send_aspup(link);
}
static int m3ua_write(struct mtp_link *mtp_link, struct msgb *msg)
{
notImplemented();
struct mtp_m3ua_client_link *link = mtp_link->data;
struct sctp_sndrcvinfo info;
struct xua_msg *m3ua;
struct mtp_level_3_hdr *mtp_hdr;
struct m3ua_protocol_data proto_data;
uint8_t *proto_start;
if (!link->asptm_active) {
LOGP(DINP, LOGL_ERROR, "ASP not ready for %d/%s of %d/%s.\n",
mtp_link->nr, mtp_link->name, mtp_link->set->nr,
mtp_link->set->name);
goto clean;
}
/*
* TODO.. we could enhance the structure of mtp_link to
* have function pointers for operations like SLTM instead
* of doing what we do here.
* The entire m3ua episode (code + reading the spec) had a
* budget of < 2 man days so the amount of architecture changes
* we can do.
*/
/* TODO.. need to terminate MTPL3 locally... */
/* TODO.. extract MTP information.. */
mtp_hdr = (struct mtp_level_3_hdr *) msg->l2h;
switch (mtp_hdr->ser_ind) {
case MTP_SI_MNT_SNM_MSG:
case MTP_SI_MNT_REG_MSG:
LOGP(DINP, LOGL_ERROR,
"Dropping SNM/REG/ISUP/??? message %d\n", mtp_hdr->ser_ind);
goto clean;
break;
case MTP_SI_MNT_ISUP:
case MTP_SI_MNT_SCCP:
default:
/* TODO... read OPC/DPC from message.. */
memset(&proto_data, 0, sizeof(proto_data));
proto_data.opc = htonl(mtp_link->set->sccp_opc);
proto_data.dpc = htonl(mtp_link->set->sccp_dpc == -1 ?
mtp_link->set->sccp_dpc : mtp_link->set->dpc);
proto_data.sls = MTP_LINK_SLS(mtp_hdr->addr);
proto_data.si = mtp_hdr->ser_ind;
proto_data.ni = mtp_link->set->ni;
msg->l3h = mtp_hdr->data;
msgb_pull_to_l3(msg);
proto_start = msgb_push(msg, sizeof(proto_data));
memcpy(proto_start, &proto_data, sizeof(proto_data));
break;
};
m3ua = xua_msg_alloc();
if (!m3ua)
goto clean;
mtp_handle_pcap(mtp_link, NET_OUT, msg->data, msg->len);
m3ua->hdr.msg_class = M3UA_CLS_TRANS;
m3ua->hdr.msg_type = M3UA_TRANS_DATA;
/*
* Modify the data...to create a true protocol data..
*/
xua_msg_add_data(m3ua, M3UA_TAG_PROTO_DATA, msg->len, msg->data);
memset(&info, 0, sizeof(info));
info.sinfo_stream = 0;
info.sinfo_assoc_id = 1;
info.sinfo_ppid = htonl(SCTP_PPID_M3UA);
m3ua_conn_send(link, m3ua, &info);
xua_msg_free(m3ua);
clean:
msgb_free(msg);
return 0;
}
@ -180,6 +323,8 @@ static int m3ua_shutdown(struct mtp_link *mtp_link)
link->queue.bfd.fd = -1;
}
osmo_wqueue_clear(&link->queue);
link->aspsm_active = 0;
link->asptm_active = 0;
return 0;
}
@ -227,3 +372,197 @@ struct mtp_m3ua_client_link *mtp_m3ua_client_link_init(struct mtp_link *blnk)
lnk->queue.bfd.fd = -1;
return lnk;
}
/*
* asp handling
*/
static void m3ua_send_aspup(struct mtp_m3ua_client_link *link)
{
struct sctp_sndrcvinfo info;
struct xua_msg *aspup;
uint32_t asp_ident;
aspup = xua_msg_alloc();
if (!aspup) {
fail_link(link);
return;
}
memset(&info, 0, sizeof(info));
info.sinfo_stream = 0;
info.sinfo_assoc_id = 1;
info.sinfo_ppid = htonl(SCTP_PPID_M3UA);
aspup->hdr.msg_class = M3UA_CLS_ASPSM;
aspup->hdr.msg_type = M3UA_ASPSM_UP;
asp_ident = htonl(link->link_index);
xua_msg_add_data(aspup, MUA_TAG_ASP_IDENT, 4, (uint8_t *) &asp_ident);
m3ua_conn_send(link, aspup, &info);
xua_msg_free(aspup);
}
static void m3ua_send_aspac(struct mtp_m3ua_client_link *link)
{
struct sctp_sndrcvinfo info;
struct xua_msg *aspac;
uint32_t routing_ctx;
uint32_t traffic_mode;
aspac = xua_msg_alloc();
if (!aspac) {
fail_link(link);
return;
}
memset(&info, 0, sizeof(info));
info.sinfo_stream = 0;
info.sinfo_assoc_id = 1;
info.sinfo_ppid = htonl(SCTP_PPID_M3UA);
aspac->hdr.msg_class = M3UA_CLS_ASPTM;
aspac->hdr.msg_type = M3UA_ASPTM_ACTIV;
traffic_mode = htonl(2);
xua_msg_add_data(aspac, 11, 4, (uint8_t *) &traffic_mode);
routing_ctx = htonl(link->routing_context);
xua_msg_add_data(aspac, MUA_TAG_ROUTING_CTX, 4, (uint8_t *) &routing_ctx);
m3ua_conn_send(link, aspac, &info);
xua_msg_free(aspac);
}
static void m3ua_send_daud(struct mtp_m3ua_client_link *link, uint32_t dpc)
{
struct sctp_sndrcvinfo info;
struct xua_msg *daud;
uint32_t routing_ctx;
daud = xua_msg_alloc();
if (!daud) {
fail_link(link);
return;
}
memset(&info, 0, sizeof(info));
info.sinfo_stream = 0;
info.sinfo_assoc_id = 1;
info.sinfo_ppid = htonl(SCTP_PPID_M3UA);
daud->hdr.msg_class = M3UA_CLS_SSNM;
daud->hdr.msg_type = M3UA_SSNM_DAUD;
routing_ctx = htonl(link->routing_context);
xua_msg_add_data(daud, MUA_TAG_ROUTING_CTX, 4, (uint8_t *) &routing_ctx);
dpc = htonl(dpc);
xua_msg_add_data(daud, MUA_TAG_AFF_PC, 4, (uint8_t *) &dpc);
m3ua_conn_send(link, daud, &info);
xua_msg_free(daud);
}
static void m3ua_handle_aspsm(struct mtp_m3ua_client_link *link, struct xua_msg *m3ua)
{
switch (m3ua->hdr.msg_type) {
case M3UA_ASPSM_UP_ACK:
LOGP(DINP, LOGL_NOTICE, "Received ASP_UP_ACK.. sending ASPAC\n");
link->aspsm_active = 1;
m3ua_send_aspac(link);
break;
default:
LOGP(DINP, LOGL_ERROR, "Unhandled msg_type %d\n",
m3ua->hdr.msg_type);
break;
}
}
static void m3ua_handle_asptm(struct mtp_m3ua_client_link *link, struct xua_msg *m3ua)
{
switch (m3ua->hdr.msg_type) {
case M3UA_ASPTM_ACTIV_ACK:
LOGP(DINP, LOGL_NOTICE, "Received ASPAC_ACK.. taking link up\n");
link->asptm_active = 1;
mtp_link_up(link->base);
m3ua_send_daud(link, link->base->set->dpc);
if (link->base->set->sccp_dpc != -1)
m3ua_send_daud(link, link->base->set->sccp_dpc);
break;
default:
LOGP(DINP, LOGL_ERROR, "Unhandled msg_type %d\n",
m3ua->hdr.msg_type);
break;
}
}
static void m3ua_handle_trans(struct mtp_m3ua_client_link *link, struct xua_msg *m3ua)
{
struct msgb *msg;
struct xua_msg_part *data;
struct mtp_link *mtp_link;
struct m3ua_protocol_data *proto;
struct mtp_level_3_hdr *mtp_hdr;
uint32_t opc, dpc;
uint8_t sls, si;
mtp_link = link->base;
/* ignore everything if the link is blocked */
if (mtp_link->blocked)
return;
if (m3ua->hdr.msg_type != M3UA_TRANS_DATA) {
LOGP(DINP, LOGL_ERROR, "msg_type(%d) is not known. Ignoring\n",
m3ua->hdr.msg_type);
return;
}
data = xua_msg_find_tag(m3ua, M3UA_TAG_PROTO_DATA);
if (!data) {
LOGP(DINP, LOGL_ERROR, "No PROTO_DATA in DATA message.\n");
return;
}
if (data->len > 2048) {
LOGP(DINP, LOGL_ERROR, "TOO much data for us to handle.\n");
return;
}
if (data->len < sizeof(struct m3ua_protocol_data)) {
LOGP(DINP, LOGL_ERROR, "Too little data..\n");
return;
}
msg = msgb_alloc(2048, "m3ua-data");
if (!msg) {
LOGP(DINP, LOGL_ERROR, "Failed to allocate storage.\n");
return;
}
msg->l2h = msgb_put(msg, data->len);
memcpy(msg->l2h, data->dat, data->len);
proto = (struct m3ua_protocol_data *) msg->l2h;
opc = ntohl(proto->opc);
dpc = ntohl(proto->dpc);
sls = proto->sls;
si = proto->si;
LOGP(DINP, LOGL_DEBUG, "Got data for OPC(%d)/DPC(%d)/SLS(%d) len(%d)\n",
opc, dpc, sls, msgb_l2len(msg) - sizeof(*proto));
/* put a MTP3 header in front */
msg->l3h = proto->data;
msgb_pull_to_l3(msg);
msg->l2h = msgb_push(msg, sizeof(*mtp_hdr));
mtp_hdr = (struct mtp_level_3_hdr *) msg->l2h;
mtp_hdr->ser_ind = si;
mtp_hdr->addr = MTP_ADDR(sls % 16, dpc, opc);
mtp_handle_pcap(mtp_link, NET_IN, msg->l2h, msgb_l2len(msg));
mtp_link_set_data(mtp_link, msg);
msgb_free(msg);
}