201 lines
4.5 KiB
C
201 lines
4.5 KiB
C
#include <errno.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/abis/ipa.h>
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#include <osmocom/abis/ipaccess.h>
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#include "gsup_server.h"
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static void osmo_gsup_server_send(struct osmo_gsup_conn *conn,
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int proto_ext, struct msgb *msg_tx)
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{
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ipa_prepend_header_ext(msg_tx, proto_ext);
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ipa_msg_push_header(msg_tx, IPAC_PROTO_OSMO);
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ipa_server_conn_send(conn->conn, msg_tx);
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}
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int osmo_gsup_conn_send(struct osmo_gsup_conn *conn, struct msgb *msg)
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{
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if (!conn) {
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msgb_free(msg);
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return -ENOTCONN;
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}
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osmo_gsup_server_send(conn, IPAC_PROTO_EXT_GSUP, msg);
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return 0;
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}
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static int osmo_gsup_conn_oap_handle(struct osmo_gsup_conn *conn,
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struct msgb *msg_rx)
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{
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int rc;
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struct msgb *msg_tx;
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#if 0
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rc = oap_handle(&conn->oap_state, msg_rx, &msg_tx);
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msgb_free(msg_rx);
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if (rc < 0)
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return rc;
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if (msg_tx)
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osmo_gsup_conn_send(conn, IPAC_PROTO_EXT_OAP, msg_tx);
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#endif
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return 0;
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}
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/* Data from a given client has arrived over the socket */
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static int osmo_gsup_server_read_cb(struct ipa_server_conn *conn,
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struct msgb *msg)
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{
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struct ipaccess_head *hh = (struct ipaccess_head *) msg->data;
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struct ipaccess_head_ext *he = (struct ipaccess_head_ext *) msgb_l2(msg);
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struct osmo_gsup_conn *clnt = (struct osmo_gsup_conn *)conn->data;
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int rc;
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msg->l2h = &hh->data[0];
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if (hh->proto == IPAC_PROTO_IPACCESS) {
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rc = ipa_server_conn_ccm(conn, msg);
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if (rc < 0) {
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/* conn is already invalid here! */
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msgb_free(msg);
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return -1;
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}
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return 0;
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}
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if (hh->proto != IPAC_PROTO_OSMO)
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goto invalid;
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if (!he || msgb_l2len(msg) < sizeof(*he))
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goto invalid;
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msg->l2h = &he->data[0];
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if (he->proto == IPAC_PROTO_EXT_GSUP) {
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OSMO_ASSERT(clnt->server->read_cb != NULL);
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clnt->server->read_cb(clnt, msg);
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/* expecting read_cb() to free msg */
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} else if (he->proto == IPAC_PROTO_EXT_OAP) {
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return osmo_gsup_conn_oap_handle(clnt, msg);
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/* osmo_gsup_client_oap_handle frees msg */
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} else
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goto invalid;
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return 0;
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invalid:
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LOGP(DLGSUP, LOGL_NOTICE,
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"GSUP received an invalid IPA message from %s:%d, size = %d\n",
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conn->addr, conn->port, msgb_length(msg));
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msgb_free(msg);
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return -1;
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}
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static int osmo_gsup_server_ccm_cb(struct ipa_server_conn *conn,
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struct msgb *msg, struct tlv_parsed *tlvp,
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struct ipaccess_unit *unit)
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{
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LOGP(DLGSUP, LOGL_INFO, "CCM Callback\n");
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/* TODO: ? */
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return 0;
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}
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static int osmo_gsup_server_closed_cb(struct ipa_server_conn *conn)
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{
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struct osmo_gsup_conn *clnt = (struct osmo_gsup_conn *)conn->data;
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LOGP(DLGSUP, LOGL_INFO, "Lost GSUP client %s:%d\n",
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conn->addr, conn->port);
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llist_del(&clnt->list);
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return 0;
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}
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/* a client has connected to the server socket and we have accept()ed it */
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static int osmo_gsup_server_accept_cb(struct ipa_server_link *link, int fd)
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{
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struct osmo_gsup_conn *conn;
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struct osmo_gsup_server *gsups =
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(struct osmo_gsup_server *) link->data;
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int rc;
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conn = talloc_zero(link->data, struct osmo_gsup_conn);
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OSMO_ASSERT(conn);
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conn->conn = ipa_server_conn_create(conn, link, fd,
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osmo_gsup_server_read_cb,
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osmo_gsup_server_closed_cb, conn);
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conn->conn->ccm_cb = osmo_gsup_server_ccm_cb;
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OSMO_ASSERT(conn->conn);
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/* link data structure with server structure */
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conn->server = gsups;
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llist_add_tail(&conn->list, &gsups->clients);
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LOGP(DLGSUP, LOGL_INFO, "New GSUP client %s:%d\n",
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conn->conn->addr, conn->conn->port);
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/* request the identity of the client */
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rc = ipa_ccm_send_id_req(fd);
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if (rc < 0)
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goto failed;
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#if 0
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rc = oap_init(&gsups->oap_config, &conn->oap_state);
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if (rc != 0)
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goto failed;
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#endif
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return 0;
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failed:
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ipa_server_conn_destroy(conn->conn);
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return -1;
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}
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struct osmo_gsup_server *
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osmo_gsup_server_create(void *ctx, const char *ip_addr,
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uint16_t tcp_port,
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osmo_gsup_read_cb_t read_cb)
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{
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struct osmo_gsup_server *gsups;
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int rc;
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gsups = talloc_zero(ctx, struct osmo_gsup_server);
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OSMO_ASSERT(gsups);
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INIT_LLIST_HEAD(&gsups->clients);
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gsups->link = ipa_server_link_create(gsups,
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/* no e1inp */ NULL,
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ip_addr, tcp_port,
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osmo_gsup_server_accept_cb,
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gsups);
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if (!gsups->link)
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goto failed;
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gsups->read_cb = read_cb;
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rc = ipa_server_link_open(gsups->link);
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if (rc < 0)
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goto failed;
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return gsups;
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failed:
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osmo_gsup_server_destroy(gsups);
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return NULL;
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}
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void osmo_gsup_server_destroy(struct osmo_gsup_server *gsups)
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{
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if (gsups->link) {
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ipa_server_link_close(gsups->link);
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ipa_server_link_destroy(gsups->link);
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gsups->link = NULL;
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}
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talloc_free(gsups);
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}
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