539 lines
14 KiB
C
539 lines
14 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#include <unistd.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <assert.h>
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#include <sys/types.h>
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#include <signal.h>
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#include <errno.h>
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#include <pthread.h>
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/select.h>
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#include <osmocom/core/application.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/core/stats.h>
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#include <osmocom/core/rate_ctr.h>
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#include <osmocom/core/socket.h>
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#include <osmocom/vty/telnet_interface.h>
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#include <osmocom/vty/logging.h>
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#include <osmocom/vty/stats.h>
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#include <osmocom/vty/ports.h>
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#include <osmocom/vty/command.h>
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#include <osmocom/vty/misc.h>
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#include <osmocom/netif/stream.h>
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#include <netinet/sctp.h>
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#include <jansson.h>
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#include "internal.h"
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#include "netns.h"
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#include "gtp.h"
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/***********************************************************************
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* Client (Contol/User Plane Separation) Socket
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***********************************************************************/
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#define CUPS_MSGB_SIZE 1024
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#define LOGCC(cc, lvl, fmt, args ...) \
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LOGP(DUECUPS, lvl, "%s: " fmt, (cc)->sockname, ## args)
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struct cups_client {
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/* member in daemon->cups_clients */
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struct llist_head list;
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/* back-pointer to daemon */
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struct gtp_daemon *d;
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/* client socket */
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struct osmo_stream_srv *srv;
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char sockname[OSMO_SOCK_NAME_MAXLEN];
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};
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/* Send JSON to a given client/connection */
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static int cups_client_tx_json(struct cups_client *cc, json_t *jtx)
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{
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struct msgb *msg = msgb_alloc(CUPS_MSGB_SIZE, "Tx JSON");
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char *json_str = json_dumps(jtx, JSON_SORT_KEYS);
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char *out;
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int json_strlen;
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json_decref(jtx);
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if (!json_str) {
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LOGCC(cc, LOGL_ERROR, "Error encoding JSON\n");
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return 0;
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}
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json_strlen = strlen(json_str);
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LOGCC(cc, LOGL_DEBUG, "JSON Tx '%s'\n", json_str);
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if (json_strlen > msgb_tailroom(msg)) {
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LOGCC(cc, LOGL_ERROR, "Not enough room for JSON in msgb\n");
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free(json_str);
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return 0;
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}
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out = (char *)msgb_put(msg, json_strlen);
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memcpy(out, json_str, json_strlen);
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free(json_str);
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osmo_stream_srv_send(cc->srv, msg);
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return 0;
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}
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static json_t *gen_uecups_result(const char *name, const char *res)
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{
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json_t *jres = json_object();
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json_t *jret = json_object();
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json_object_set_new(jres, "result", json_string(res));
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json_object_set_new(jret, name, jres);
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return jret;
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}
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static int parse_ep(struct sockaddr_storage *out, json_t *in)
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{
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json_t *jaddr_type, *jport, *jip;
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const char *addr_type, *ip;
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uint8_t buf[16];
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/* {"addr_type":"IPV4","ip":"31323334","Port":2152} */
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if (!json_is_object(in))
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return -EINVAL;
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jaddr_type = json_object_get(in, "addr_type");
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jport = json_object_get(in, "Port");
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jip = json_object_get(in, "ip");
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if (!jaddr_type || !jport || !jip)
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return -EINVAL;
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if (!json_is_string(jaddr_type) || !json_is_integer(jport) || !json_is_string(jip))
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return -EINVAL;
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addr_type = json_string_value(jaddr_type);
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ip = json_string_value(jip);
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memset(out, 0, sizeof(*out));
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if (!strcmp(addr_type, "IPV4")) {
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struct sockaddr_in *sin = (struct sockaddr_in *) out;
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if (osmo_hexparse(ip, buf, sizeof(buf)) != 4)
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return -EINVAL;
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memcpy(&sin->sin_addr, buf, 4);
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sin->sin_family = AF_INET;
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sin->sin_port = htons(json_integer_value(jport));
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} else if (!strcmp(addr_type, "IPV6")) {
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struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) out;
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if (osmo_hexparse(ip, buf, sizeof(buf)) != 16)
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return -EINVAL;
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memcpy(&sin6->sin6_addr, buf, 16);
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sin6->sin6_family = AF_INET6;
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sin6->sin6_port = htons(json_integer_value(jport));
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} else
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return -EINVAL;
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return 0;
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}
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static int parse_eua(struct sockaddr_storage *out, json_t *jip, json_t *jaddr_type)
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{
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const char *addr_type, *ip;
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uint8_t buf[16];
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if (!json_is_string(jip) || !json_is_string(jaddr_type))
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return -EINVAL;
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addr_type = json_string_value(jaddr_type);
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ip = json_string_value(jip);
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memset(out, 0, sizeof(*out));
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if (!strcmp(addr_type, "IPV4")) {
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struct sockaddr_in *sin = (struct sockaddr_in *) out;
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if (osmo_hexparse(ip, buf, sizeof(buf)) != 4)
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return -EINVAL;
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memcpy(&sin->sin_addr, buf, 4);
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sin->sin_family = AF_INET;
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} else if (!strcmp(addr_type, "IPV6")) {
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struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) out;
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if (osmo_hexparse(ip, buf, sizeof(buf)) != 16)
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return -EINVAL;
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memcpy(&sin6->sin6_addr, buf, 16);
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sin6->sin6_family = AF_INET6;
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} else
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return -EINVAL;
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return 0;
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}
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static int parse_create_tun(struct gtp_tunnel_params *out, json_t *ctun)
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{
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json_t *jlocal_gtp_ep, *jremote_gtp_ep;
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json_t *jrx_teid, *jtx_teid;
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json_t *jtun_dev_name, *jtun_netns_name;
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json_t *juser_addr, *juser_addr_type;
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int rc;
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/* '{"create_tun":{"tx_teid":1234,"rx_teid":5678,"user_addr_type":"IPV4","user_addr":"21222324","local_gtp_ep":{"addr_type":"IPV4","ip":"31323334","Port":2152},"remote_gtp_ep":{"addr_type":"IPV4","ip":"41424344","Port":2152},"tun_dev_name":"tun23","tun_netns_name":"foo"}}' */
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if (!json_is_object(ctun))
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return -EINVAL;
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/* mandatory IEs */
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jlocal_gtp_ep = json_object_get(ctun, "local_gtp_ep");
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jremote_gtp_ep = json_object_get(ctun, "remote_gtp_ep");
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jrx_teid = json_object_get(ctun, "rx_teid");
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jtx_teid = json_object_get(ctun, "tx_teid");
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jtun_dev_name = json_object_get(ctun, "tun_dev_name");
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juser_addr = json_object_get(ctun, "user_addr");
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juser_addr_type = json_object_get(ctun, "user_addr_type");
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if (!jlocal_gtp_ep || !jremote_gtp_ep || !jrx_teid || !jtx_teid || !jtun_dev_name ||
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!juser_addr || !juser_addr_type)
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return -EINVAL;
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if (!json_is_object(jlocal_gtp_ep) || !json_is_object(jremote_gtp_ep) ||
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!json_is_integer(jrx_teid) || !json_is_integer(jtx_teid) ||
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!json_is_string(jtun_dev_name) ||
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!json_is_string(juser_addr) || !json_is_string(juser_addr_type))
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return -EINVAL;
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memset(out, 0, sizeof(*out));
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rc = parse_ep(&out->local_udp, jlocal_gtp_ep);
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if (rc < 0)
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return rc;
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rc = parse_ep(&out->remote_udp, jremote_gtp_ep);
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if (rc < 0)
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return rc;
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rc = parse_eua(&out->user_addr, juser_addr, juser_addr_type);
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if (rc < 0)
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return rc;
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out->rx_teid = json_integer_value(jrx_teid);
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out->tx_teid = json_integer_value(jtx_teid);
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out->tun_name = talloc_strdup(out, json_string_value(jtun_dev_name));
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/* optional IEs */
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jtun_netns_name = json_object_get(ctun, "tun_netns_name");
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if (jtun_netns_name) {
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if (!json_is_string(jtun_netns_name))
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return -EINVAL;
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out->tun_netns_name = talloc_strdup(out, json_string_value(jtun_netns_name));
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}
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return 0;
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}
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static int cups_client_handle_create_tun(struct cups_client *cc, json_t *ctun)
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{
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int rc;
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struct gtp_tunnel_params *tpars = talloc_zero(cc, struct gtp_tunnel_params);
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struct gtp_tunnel *t;
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rc = parse_create_tun(tpars, ctun);
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if (rc < 0) {
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talloc_free(tpars);
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return rc;
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}
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t = gtp_tunnel_alloc(g_daemon, tpars);
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if (!t) {
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LOGCC(cc, LOGL_NOTICE, "Failed to allocate tunnel\n");
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cups_client_tx_json(cc, gen_uecups_result("create_tun_res", "ERR_NOT_FOUND"));
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} else {
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cups_client_tx_json(cc, gen_uecups_result("create_tun_res", "OK"));
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}
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talloc_free(tpars);
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return 0;
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}
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static int cups_client_handle_destroy_tun(struct cups_client *cc, json_t *dtun)
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{
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struct sockaddr_storage local_ep_addr;
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json_t *jlocal_gtp_ep, *jrx_teid;
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uint32_t rx_teid;
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int rc;
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jlocal_gtp_ep = json_object_get(dtun, "local_gtp_ep");
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jrx_teid = json_object_get(dtun, "rx_teid");
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if (!jlocal_gtp_ep || !jrx_teid)
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return -EINVAL;
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if (!json_is_object(jlocal_gtp_ep) || !json_is_integer(jrx_teid))
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return -EINVAL;
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rc = parse_ep(&local_ep_addr, jlocal_gtp_ep);
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if (rc < 0)
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return rc;
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rx_teid = json_integer_value(jrx_teid);
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rc = gtp_tunnel_destroy(g_daemon, &local_ep_addr, rx_teid);
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if (rc < 0) {
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LOGCC(cc, LOGL_NOTICE, "Failed to destroy tunnel\n");
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cups_client_tx_json(cc, gen_uecups_result("destroy_tun_res", "ERR_NOT_FOUND"));
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} else {
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cups_client_tx_json(cc, gen_uecups_result("destroy_tun_res", "OK"));
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}
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return 0;
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}
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static int cups_client_handle_json(struct cups_client *cc, json_t *jroot)
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{
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void *iter;
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const char *key;
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json_t *cmd;
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int rc;
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if (!json_is_object(jroot))
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return -EINVAL;
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iter = json_object_iter(jroot);
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key = json_object_iter_key(iter);
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cmd = json_object_iter_value(iter);
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if (!iter || !key || !cmd)
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return -EINVAL;
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if (!strcmp(key, "create_tun")) {
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rc = cups_client_handle_create_tun(cc, cmd);
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} else if (!strcmp(key, "destroy_tun")) {
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rc = cups_client_handle_destroy_tun(cc, cmd);
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} else {
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LOGCC(cc, LOGL_NOTICE, "Unknown command '%s' received\n", key);
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return -EINVAL;
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}
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if (rc < 0) {
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LOGCC(cc, LOGL_NOTICE, "Error %d handling '%s' command\n", rc, key);
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char buf[64];
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snprintf(buf, sizeof(buf), "%s_res", key);
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cups_client_tx_json(cc, gen_uecups_result(buf, "ERR_INVALID_DATA"));
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return -EINVAL;
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}
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return 0;
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}
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/* control/user plane separation per-client read cb */
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static int cups_client_read_cb(struct osmo_stream_srv *conn)
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{
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struct osmo_fd *ofd = osmo_stream_srv_get_ofd(conn);
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struct cups_client *cc = osmo_stream_srv_get_data(conn);
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struct msgb *msg = msgb_alloc(CUPS_MSGB_SIZE, "Rx JSON");
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struct sctp_sndrcvinfo sinfo;
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json_error_t jerr;
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json_t *jroot;
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int flags = 0;
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int rc = 0;
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/* Read message from socket */
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/* we cannot use osmo_stream_srv_recv() here, as we might get some out-of-band info from
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* SCTP. FIXME: add something like osmo_stream_srv_recv_sctp() to libosmo-netif and use
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* it here as well as in libosmo-sigtran and osmo-msc */
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rc = sctp_recvmsg(ofd->fd, msg->tail, msgb_tailroom(msg), NULL, NULL, &sinfo,&flags);
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if (rc <= 0) {
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osmo_stream_srv_destroy(conn);
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rc = -1;
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goto out;
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} else
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msgb_put(msg, rc);
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if (flags & MSG_NOTIFICATION) {
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union sctp_notification *notif = (union sctp_notification *) msgb_data(msg);
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switch (notif->sn_header.sn_type) {
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case SCTP_SHUTDOWN_EVENT:
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osmo_stream_srv_destroy(conn);
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rc = -EBADF;
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goto out;
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default:
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break;
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}
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goto out;
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}
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LOGCC(cc, LOGL_DEBUG, "Rx '%s'\n", msgb_data(msg));
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/* Parse the JSON */
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jroot = json_loadb((const char *) msgb_data(msg), msgb_length(msg), 0, &jerr);
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if (!jroot) {
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LOGCC(cc, LOGL_ERROR, "Error decoding JSON (%s)", jerr.text);
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rc = -1;
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goto out;
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}
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/* Dispatch */
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rc = cups_client_handle_json(cc, jroot);
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json_decref(jroot);
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msgb_free(msg);
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return 0;
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out:
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msgb_free(msg);
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return rc;
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}
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static int cups_client_closed_cb(struct osmo_stream_srv *conn)
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{
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struct cups_client *cc = osmo_stream_srv_get_data(conn);
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LOGCC(cc, LOGL_INFO, "UECUPS connection lost\n");
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llist_del(&cc->list);
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return 0;
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}
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/* the control/user plane separation server bind/accept fd */
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static int cups_accept_cb(struct osmo_stream_srv_link *link, int fd)
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{
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struct gtp_daemon *d = osmo_stream_srv_link_get_data(link);
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struct cups_client *cc;
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cc = talloc_zero(d, struct cups_client);
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if (!cc)
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return -1;
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osmo_sock_get_name_buf(cc->sockname, sizeof(cc->sockname), fd);
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cc->srv = osmo_stream_srv_create(cc, link, fd, cups_client_read_cb, cups_client_closed_cb, cc);
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if (!cc->srv) {
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talloc_free(cc);
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return -1;
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}
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LOGCC(cc, LOGL_INFO, "Accepted new UECUPS connection\n");
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llist_add_tail(&cc->list, &d->cups_clients);
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return 0;
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}
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/***********************************************************************
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* GTP Daemon
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***********************************************************************/
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struct gtp_daemon *g_daemon;
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static int g_daemonize;
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static char *g_config_file = "osmo-gtpu-daemon.cfg";
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extern struct vty_app_info g_vty_info;
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static struct gtp_daemon *gtp_daemon_alloc(void *ctx)
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{
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struct gtp_daemon *d = talloc_zero(ctx, struct gtp_daemon);
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if (!d)
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return NULL;
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INIT_LLIST_HEAD(&d->gtp_endpoints);
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INIT_LLIST_HEAD(&d->tun_devices);
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INIT_LLIST_HEAD(&d->gtp_tunnels);
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pthread_rwlock_init(&d->rwlock, NULL);
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d->main_thread = pthread_self();
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INIT_LLIST_HEAD(&d->cups_clients);
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d->cfg.cups_local_ip = talloc_strdup(d, "localhost");
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d->cfg.cups_local_port = 4300;
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return d;
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}
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static const struct log_info_cat log_categories[] = {
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[DTUN] = {
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.name ="DTUN",
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.description = "Tunnel interface (tun device)",
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.enabled = 1, .loglevel = LOGL_INFO,
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},
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[DEP] = {
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.name = "DEP",
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.description = "GTP endpoint (UDP socket)",
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.enabled = 1, .loglevel = LOGL_INFO,
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},
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[DGT] = {
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.name = "DGT",
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.description = "GTP tunnel (session)",
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.enabled = 1, .loglevel = LOGL_INFO,
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},
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[DUECUPS] = {
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.name = "DUECUPS",
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.description = "UE Control User Plane Separation",
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.enabled = 1, .loglevel = LOGL_DEBUG,
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},
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};
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static const struct log_info log_info = {
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.cat = log_categories,
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|
.num_cat = ARRAY_SIZE(log_categories),
|
|
};
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
void *ctx = talloc_named_const(NULL, 0, "root");
|
|
int rc;
|
|
|
|
g_vty_info.tall_ctx = ctx;
|
|
|
|
osmo_init_ignore_signals();
|
|
osmo_init_logging2(ctx, &log_info);
|
|
|
|
g_daemon = gtp_daemon_alloc(ctx);
|
|
OSMO_ASSERT(g_daemon);
|
|
|
|
osmo_stats_init(ctx);
|
|
vty_init(&g_vty_info);
|
|
logging_vty_add_cmds();
|
|
osmo_talloc_vty_add_cmds();
|
|
osmo_stats_vty_add_cmds();
|
|
rate_ctr_init(ctx);
|
|
gtpud_vty_init();
|
|
|
|
init_netns();
|
|
|
|
rc = vty_read_config_file(g_config_file, NULL);
|
|
if (rc < 0) {
|
|
fprintf(stderr, "Failed to open config file: '%s'\n", g_config_file);
|
|
exit(2);
|
|
}
|
|
|
|
rc = telnet_init_dynif(ctx, NULL, vty_get_bind_addr(), OSMO_VTY_PORT_GGSN);
|
|
if (rc < 0)
|
|
exit(1);
|
|
|
|
g_daemon->cups_link = osmo_stream_srv_link_create(g_daemon);
|
|
if (!g_daemon->cups_link) {
|
|
fprintf(stderr, "Failed to create CUPS socket %s:%u (%s)\n",
|
|
g_daemon->cfg.cups_local_ip, g_daemon->cfg.cups_local_port, strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
/* UECUPS socket for control from control plane side */
|
|
osmo_stream_srv_link_set_nodelay(g_daemon->cups_link, true);
|
|
osmo_stream_srv_link_set_addr(g_daemon->cups_link, g_daemon->cfg.cups_local_ip);
|
|
osmo_stream_srv_link_set_port(g_daemon->cups_link, g_daemon->cfg.cups_local_port);
|
|
osmo_stream_srv_link_set_proto(g_daemon->cups_link, IPPROTO_SCTP);
|
|
osmo_stream_srv_link_set_data(g_daemon->cups_link, g_daemon);
|
|
osmo_stream_srv_link_set_accept_cb(g_daemon->cups_link, cups_accept_cb);
|
|
osmo_stream_srv_link_open(g_daemon->cups_link);
|
|
|
|
if (g_daemonize) {
|
|
rc = osmo_daemonize();
|
|
if (rc < 0) {
|
|
perror("Error during daemonize");
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
while (1) {
|
|
osmo_select_main(0);
|
|
}
|
|
}
|