| /* SPDX-License-Identifier: GPL-2.0 */ |
| #include <unistd.h> |
| #include <stdint.h> |
| #include <stdbool.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <stdio.h> |
| #include <assert.h> |
| #include <sys/types.h> |
| #include <signal.h> |
| #include <errno.h> |
| |
| #include <pthread.h> |
| |
| #include <osmocom/core/linuxlist.h> |
| #include <osmocom/core/talloc.h> |
| #include <osmocom/core/select.h> |
| #include <osmocom/core/application.h> |
| #include <osmocom/core/logging.h> |
| #include <osmocom/core/stats.h> |
| #include <osmocom/core/rate_ctr.h> |
| #include <osmocom/core/socket.h> |
| #include <osmocom/vty/telnet_interface.h> |
| #include <osmocom/vty/logging.h> |
| #include <osmocom/vty/stats.h> |
| #include <osmocom/vty/ports.h> |
| #include <osmocom/vty/command.h> |
| #include <osmocom/vty/misc.h> |
| |
| #include <osmocom/netif/stream.h> |
| #include <netinet/sctp.h> |
| |
| #include <jansson.h> |
| |
| #include "internal.h" |
| #include "netns.h" |
| #include "gtp.h" |
| |
| /*********************************************************************** |
| * Client (Contol/User Plane Separation) Socket |
| ***********************************************************************/ |
| |
| #define CUPS_MSGB_SIZE 1024 |
| |
| #define LOGCC(cc, lvl, fmt, args ...) \ |
| LOGP(DUECUPS, lvl, "%s: " fmt, (cc)->sockname, ## args) |
| |
| struct cups_client { |
| /* member in daemon->cups_clients */ |
| struct llist_head list; |
| /* back-pointer to daemon */ |
| struct gtp_daemon *d; |
| /* client socket */ |
| struct osmo_stream_srv *srv; |
| char sockname[OSMO_SOCK_NAME_MAXLEN]; |
| }; |
| |
| /* Send JSON to a given client/connection */ |
| static int cups_client_tx_json(struct cups_client *cc, json_t *jtx) |
| { |
| struct msgb *msg = msgb_alloc(CUPS_MSGB_SIZE, "Tx JSON"); |
| char *json_str = json_dumps(jtx, JSON_SORT_KEYS); |
| char *out; |
| int json_strlen; |
| |
| json_decref(jtx); |
| if (!json_str) { |
| LOGCC(cc, LOGL_ERROR, "Error encoding JSON\n"); |
| return 0; |
| } |
| json_strlen = strlen(json_str); |
| |
| LOGCC(cc, LOGL_DEBUG, "JSON Tx '%s'\n", json_str); |
| |
| if (json_strlen > msgb_tailroom(msg)) { |
| LOGCC(cc, LOGL_ERROR, "Not enough room for JSON in msgb\n"); |
| free(json_str); |
| return 0; |
| } |
| |
| out = (char *)msgb_put(msg, json_strlen); |
| memcpy(out, json_str, json_strlen); |
| free(json_str); |
| osmo_stream_srv_send(cc->srv, msg); |
| |
| return 0; |
| } |
| |
| static json_t *gen_uecups_result(const char *name, const char *res) |
| { |
| json_t *jres = json_object(); |
| json_t *jret = json_object(); |
| |
| json_object_set_new(jres, "result", json_string(res)); |
| json_object_set_new(jret, name, jres); |
| |
| return jret; |
| } |
| |
| static int parse_ep(struct sockaddr_storage *out, json_t *in) |
| { |
| json_t *jaddr_type, *jport, *jip; |
| const char *addr_type, *ip; |
| uint8_t buf[16]; |
| |
| /* {"addr_type":"IPV4","ip":"31323334","Port":2152} */ |
| |
| if (!json_is_object(in)) |
| return -EINVAL; |
| |
| jaddr_type = json_object_get(in, "addr_type"); |
| jport = json_object_get(in, "Port"); |
| jip = json_object_get(in, "ip"); |
| |
| if (!jaddr_type || !jport || !jip) |
| return -EINVAL; |
| |
| if (!json_is_string(jaddr_type) || !json_is_integer(jport) || !json_is_string(jip)) |
| return -EINVAL; |
| |
| addr_type = json_string_value(jaddr_type); |
| ip = json_string_value(jip); |
| |
| memset(out, 0, sizeof(*out)); |
| |
| if (!strcmp(addr_type, "IPV4")) { |
| struct sockaddr_in *sin = (struct sockaddr_in *) out; |
| if (osmo_hexparse(ip, buf, sizeof(buf)) != 4) |
| return -EINVAL; |
| memcpy(&sin->sin_addr, buf, 4); |
| sin->sin_family = AF_INET; |
| sin->sin_port = htons(json_integer_value(jport)); |
| } else if (!strcmp(addr_type, "IPV6")) { |
| struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) out; |
| if (osmo_hexparse(ip, buf, sizeof(buf)) != 16) |
| return -EINVAL; |
| memcpy(&sin6->sin6_addr, buf, 16); |
| sin6->sin6_family = AF_INET6; |
| sin6->sin6_port = htons(json_integer_value(jport)); |
| } else |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static int parse_eua(struct sockaddr_storage *out, json_t *jip, json_t *jaddr_type) |
| { |
| const char *addr_type, *ip; |
| uint8_t buf[16]; |
| |
| if (!json_is_string(jip) || !json_is_string(jaddr_type)) |
| return -EINVAL; |
| |
| addr_type = json_string_value(jaddr_type); |
| ip = json_string_value(jip); |
| |
| memset(out, 0, sizeof(*out)); |
| |
| if (!strcmp(addr_type, "IPV4")) { |
| struct sockaddr_in *sin = (struct sockaddr_in *) out; |
| if (osmo_hexparse(ip, buf, sizeof(buf)) != 4) |
| return -EINVAL; |
| memcpy(&sin->sin_addr, buf, 4); |
| sin->sin_family = AF_INET; |
| } else if (!strcmp(addr_type, "IPV6")) { |
| struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) out; |
| if (osmo_hexparse(ip, buf, sizeof(buf)) != 16) |
| return -EINVAL; |
| memcpy(&sin6->sin6_addr, buf, 16); |
| sin6->sin6_family = AF_INET6; |
| } else |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| |
| static int parse_create_tun(struct gtp_tunnel_params *out, json_t *ctun) |
| { |
| json_t *jlocal_gtp_ep, *jremote_gtp_ep; |
| json_t *jrx_teid, *jtx_teid; |
| json_t *jtun_dev_name, *jtun_netns_name; |
| json_t *juser_addr, *juser_addr_type; |
| int rc; |
| |
| /* '{"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"}}' */ |
| |
| if (!json_is_object(ctun)) |
| return -EINVAL; |
| |
| /* mandatory IEs */ |
| jlocal_gtp_ep = json_object_get(ctun, "local_gtp_ep"); |
| jremote_gtp_ep = json_object_get(ctun, "remote_gtp_ep"); |
| jrx_teid = json_object_get(ctun, "rx_teid"); |
| jtx_teid = json_object_get(ctun, "tx_teid"); |
| jtun_dev_name = json_object_get(ctun, "tun_dev_name"); |
| juser_addr = json_object_get(ctun, "user_addr"); |
| juser_addr_type = json_object_get(ctun, "user_addr_type"); |
| |
| if (!jlocal_gtp_ep || !jremote_gtp_ep || !jrx_teid || !jtx_teid || !jtun_dev_name || |
| !juser_addr || !juser_addr_type) |
| return -EINVAL; |
| if (!json_is_object(jlocal_gtp_ep) || !json_is_object(jremote_gtp_ep) || |
| !json_is_integer(jrx_teid) || !json_is_integer(jtx_teid) || |
| !json_is_string(jtun_dev_name) || |
| !json_is_string(juser_addr) || !json_is_string(juser_addr_type)) |
| return -EINVAL; |
| |
| memset(out, 0, sizeof(*out)); |
| |
| rc = parse_ep(&out->local_udp, jlocal_gtp_ep); |
| if (rc < 0) |
| return rc; |
| rc = parse_ep(&out->remote_udp, jremote_gtp_ep); |
| if (rc < 0) |
| return rc; |
| rc = parse_eua(&out->user_addr, juser_addr, juser_addr_type); |
| if (rc < 0) |
| return rc; |
| out->rx_teid = json_integer_value(jrx_teid); |
| out->tx_teid = json_integer_value(jtx_teid); |
| out->tun_name = talloc_strdup(out, json_string_value(jtun_dev_name)); |
| |
| /* optional IEs */ |
| jtun_netns_name = json_object_get(ctun, "tun_netns_name"); |
| if (jtun_netns_name) { |
| if (!json_is_string(jtun_netns_name)) |
| return -EINVAL; |
| out->tun_netns_name = talloc_strdup(out, json_string_value(jtun_netns_name)); |
| } |
| |
| return 0; |
| } |
| |
| |
| static int cups_client_handle_create_tun(struct cups_client *cc, json_t *ctun) |
| { |
| int rc; |
| struct gtp_tunnel_params *tpars = talloc_zero(cc, struct gtp_tunnel_params); |
| struct gtp_tunnel *t; |
| |
| rc = parse_create_tun(tpars, ctun); |
| if (rc < 0) { |
| talloc_free(tpars); |
| return rc; |
| } |
| |
| t = gtp_tunnel_alloc(g_daemon, tpars); |
| if (!t) { |
| LOGCC(cc, LOGL_NOTICE, "Failed to allocate tunnel\n"); |
| cups_client_tx_json(cc, gen_uecups_result("create_tun_res", "ERR_NOT_FOUND")); |
| } else { |
| cups_client_tx_json(cc, gen_uecups_result("create_tun_res", "OK")); |
| } |
| |
| talloc_free(tpars); |
| return 0; |
| } |
| |
| static int cups_client_handle_destroy_tun(struct cups_client *cc, json_t *dtun) |
| { |
| struct sockaddr_storage local_ep_addr; |
| json_t *jlocal_gtp_ep, *jrx_teid; |
| uint32_t rx_teid; |
| int rc; |
| |
| jlocal_gtp_ep = json_object_get(dtun, "local_gtp_ep"); |
| jrx_teid = json_object_get(dtun, "rx_teid"); |
| |
| if (!jlocal_gtp_ep || !jrx_teid) |
| return -EINVAL; |
| |
| if (!json_is_object(jlocal_gtp_ep) || !json_is_integer(jrx_teid)) |
| return -EINVAL; |
| |
| rc = parse_ep(&local_ep_addr, jlocal_gtp_ep); |
| if (rc < 0) |
| return rc; |
| rx_teid = json_integer_value(jrx_teid); |
| |
| rc = gtp_tunnel_destroy(g_daemon, &local_ep_addr, rx_teid); |
| if (rc < 0) { |
| LOGCC(cc, LOGL_NOTICE, "Failed to destroy tunnel\n"); |
| cups_client_tx_json(cc, gen_uecups_result("destroy_tun_res", "ERR_NOT_FOUND")); |
| } else { |
| cups_client_tx_json(cc, gen_uecups_result("destroy_tun_res", "OK")); |
| } |
| |
| return 0; |
| } |
| |
| static int cups_client_handle_json(struct cups_client *cc, json_t *jroot) |
| { |
| void *iter; |
| const char *key; |
| json_t *cmd; |
| int rc; |
| |
| if (!json_is_object(jroot)) |
| return -EINVAL; |
| |
| iter = json_object_iter(jroot); |
| key = json_object_iter_key(iter); |
| cmd = json_object_iter_value(iter); |
| if (!iter || !key || !cmd) |
| return -EINVAL; |
| |
| if (!strcmp(key, "create_tun")) { |
| rc = cups_client_handle_create_tun(cc, cmd); |
| } else if (!strcmp(key, "destroy_tun")) { |
| rc = cups_client_handle_destroy_tun(cc, cmd); |
| } else { |
| LOGCC(cc, LOGL_NOTICE, "Unknown command '%s' received\n", key); |
| return -EINVAL; |
| } |
| |
| if (rc < 0) { |
| LOGCC(cc, LOGL_NOTICE, "Error %d handling '%s' command\n", rc, key); |
| char buf[64]; |
| snprintf(buf, sizeof(buf), "%s_res", key); |
| cups_client_tx_json(cc, gen_uecups_result(buf, "ERR_INVALID_DATA")); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| /* control/user plane separation per-client read cb */ |
| static int cups_client_read_cb(struct osmo_stream_srv *conn) |
| { |
| struct osmo_fd *ofd = osmo_stream_srv_get_ofd(conn); |
| struct cups_client *cc = osmo_stream_srv_get_data(conn); |
| struct msgb *msg = msgb_alloc(CUPS_MSGB_SIZE, "Rx JSON"); |
| struct sctp_sndrcvinfo sinfo; |
| json_error_t jerr; |
| json_t *jroot; |
| int flags = 0; |
| int rc = 0; |
| |
| /* Read message from socket */ |
| /* we cannot use osmo_stream_srv_recv() here, as we might get some out-of-band info from |
| * SCTP. FIXME: add something like osmo_stream_srv_recv_sctp() to libosmo-netif and use |
| * it here as well as in libosmo-sigtran and osmo-msc */ |
| rc = sctp_recvmsg(ofd->fd, msg->tail, msgb_tailroom(msg), NULL, NULL, &sinfo,&flags); |
| if (rc <= 0) { |
| osmo_stream_srv_destroy(conn); |
| rc = -1; |
| goto out; |
| } else |
| msgb_put(msg, rc); |
| |
| if (flags & MSG_NOTIFICATION) { |
| union sctp_notification *notif = (union sctp_notification *) msgb_data(msg); |
| switch (notif->sn_header.sn_type) { |
| case SCTP_SHUTDOWN_EVENT: |
| osmo_stream_srv_destroy(conn); |
| rc = -EBADF; |
| goto out; |
| default: |
| break; |
| } |
| goto out; |
| } |
| |
| LOGCC(cc, LOGL_DEBUG, "Rx '%s'\n", msgb_data(msg)); |
| |
| /* Parse the JSON */ |
| jroot = json_loadb((const char *) msgb_data(msg), msgb_length(msg), 0, &jerr); |
| if (!jroot) { |
| LOGCC(cc, LOGL_ERROR, "Error decoding JSON (%s)", jerr.text); |
| rc = -1; |
| goto out; |
| } |
| |
| /* Dispatch */ |
| rc = cups_client_handle_json(cc, jroot); |
| |
| json_decref(jroot); |
| msgb_free(msg); |
| |
| return 0; |
| out: |
| msgb_free(msg); |
| return rc; |
| } |
| |
| static int cups_client_closed_cb(struct osmo_stream_srv *conn) |
| { |
| struct cups_client *cc = osmo_stream_srv_get_data(conn); |
| |
| LOGCC(cc, LOGL_INFO, "UECUPS connection lost\n"); |
| llist_del(&cc->list); |
| return 0; |
| } |
| |
| |
| /* the control/user plane separation server bind/accept fd */ |
| static int cups_accept_cb(struct osmo_stream_srv_link *link, int fd) |
| { |
| struct gtp_daemon *d = osmo_stream_srv_link_get_data(link); |
| struct cups_client *cc; |
| |
| cc = talloc_zero(d, struct cups_client); |
| if (!cc) |
| return -1; |
| |
| osmo_sock_get_name_buf(cc->sockname, sizeof(cc->sockname), fd); |
| cc->srv = osmo_stream_srv_create(cc, link, fd, cups_client_read_cb, cups_client_closed_cb, cc); |
| if (!cc->srv) { |
| talloc_free(cc); |
| return -1; |
| } |
| LOGCC(cc, LOGL_INFO, "Accepted new UECUPS connection\n"); |
| |
| llist_add_tail(&cc->list, &d->cups_clients); |
| |
| return 0; |
| } |
| |
| /*********************************************************************** |
| * GTP Daemon |
| ***********************************************************************/ |
| |
| #ifndef OSMO_VTY_PORT_UECUPS |
| #define OSMO_VTY_PORT_UECUPS 4268 |
| #endif |
| |
| struct gtp_daemon *g_daemon; |
| static int g_daemonize; |
| static char *g_config_file = "osmo-gtpu-daemon.cfg"; |
| extern struct vty_app_info g_vty_info; |
| |
| static struct gtp_daemon *gtp_daemon_alloc(void *ctx) |
| { |
| struct gtp_daemon *d = talloc_zero(ctx, struct gtp_daemon); |
| if (!d) |
| return NULL; |
| |
| INIT_LLIST_HEAD(&d->gtp_endpoints); |
| INIT_LLIST_HEAD(&d->tun_devices); |
| INIT_LLIST_HEAD(&d->gtp_tunnels); |
| pthread_rwlock_init(&d->rwlock, NULL); |
| d->main_thread = pthread_self(); |
| |
| INIT_LLIST_HEAD(&d->cups_clients); |
| |
| d->cfg.cups_local_ip = talloc_strdup(d, "localhost"); |
| d->cfg.cups_local_port = UECUPS_SCTP_PORT; |
| |
| return d; |
| } |
| |
| static const struct log_info_cat log_categories[] = { |
| [DTUN] = { |
| .name ="DTUN", |
| .description = "Tunnel interface (tun device)", |
| .enabled = 1, .loglevel = LOGL_INFO, |
| }, |
| [DEP] = { |
| .name = "DEP", |
| .description = "GTP endpoint (UDP socket)", |
| .enabled = 1, .loglevel = LOGL_INFO, |
| }, |
| [DGT] = { |
| .name = "DGT", |
| .description = "GTP tunnel (session)", |
| .enabled = 1, .loglevel = LOGL_INFO, |
| }, |
| [DUECUPS] = { |
| .name = "DUECUPS", |
| .description = "UE Control User Plane Separation", |
| .enabled = 1, .loglevel = LOGL_DEBUG, |
| }, |
| |
| }; |
| |
| static const struct log_info log_info = { |
| .cat = log_categories, |
| .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_UECUPS); |
| 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); |
| } |
| } |