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.
diff --git a/include/sctp_m3ua.h b/include/sctp_m3ua.h
index f59b5de..0cc405f 100644
--- a/include/sctp_m3ua.h
+++ b/include/sctp_m3ua.h
@@ -22,6 +22,11 @@
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);
diff --git a/src/sctp_m3ua_client.c b/src/sctp_m3ua_client.c
index 0cef103..dd378bb 100644
--- a/src/sctp_m3ua_client.c
+++ b/src/sctp_m3ua_client.c
@@ -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 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 @@
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 @@
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 @@
link->queue.bfd.fd = -1;
}
osmo_wqueue_clear(&link->queue);
+ link->aspsm_active = 0;
+ link->asptm_active = 0;
return 0;
}
@@ -227,3 +372,197 @@
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);
+}