613 lines
16 KiB
C
613 lines
16 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 <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/logging.h>
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#include <osmocom/core/exec.h>
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#include "internal.h"
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#include <netinet/sctp.h>
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/***********************************************************************
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* Client (Control/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 subprocess {
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/* member in daemon->cups_clients */
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struct llist_head list;
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/* pointer to the client that started us */
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struct cups_client *cups_client;
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/* PID of the process */
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pid_t pid;
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};
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static json_t *gen_uecups_term_ind(pid_t pid, int status);
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/* kill the specified subprocess and forget about it */
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static void subprocess_destroy(struct subprocess *p, int signal)
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{
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LOGCC(p->cups_client, LOGL_DEBUG, "Kill subprocess pid %llu with signal %u\n",
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(unsigned long long)p->pid, signal);
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kill(p->pid, signal);
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llist_del(&p->list);
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talloc_free(p);
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}
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static struct subprocess *subprocess_by_pid(struct gtp_daemon *d, pid_t pid)
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{
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struct subprocess *sproc;
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llist_for_each_entry(sproc, &d->subprocesses, list) {
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if (sproc->pid == pid)
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return sproc;
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}
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return NULL;
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}
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void child_terminated(struct gtp_daemon *d, int pid, int status)
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{
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struct subprocess *sproc;
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json_t *jterm_ind;
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LOGP(DUECUPS, LOGL_DEBUG, "SIGCHLD receive from pid %u; status=%d\n", pid, status);
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sproc = subprocess_by_pid(d, pid);
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if (!sproc) {
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LOGP(DUECUPS, LOGL_NOTICE, "subprocess %u terminated (status=%d) but we don't know it?\n",
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pid, status);
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return;
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}
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/* generate prog_term_ind towards control plane */
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jterm_ind = gen_uecups_term_ind(pid, status);
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if (!jterm_ind)
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return;
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cups_client_tx_json(sproc->cups_client, jterm_ind);
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llist_del(&sproc->list);
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talloc_free(sproc);
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}
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/* Send JSON to a given client/connection */
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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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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 json_t *gen_uecups_term_ind(pid_t pid, int status)
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{
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json_t *jterm = json_object();
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json_t *jret = json_object();
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json_object_set_new(jterm, "pid", json_integer(pid));
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json_object_set_new(jterm, "exit_code", json_integer(status));
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json_object_set_new(jret, "program_term_ind", jterm);
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return jret;
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}
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static json_t *gen_uecups_start_res(pid_t pid, const char *result)
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{
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json_t *ret = gen_uecups_result("start_program_res", result);
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json_object_set_new(json_object_get(ret, "start_program_res"), "pid", json_integer(pid));
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return ret;
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}
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static int cups_client_handle_start_program(struct cups_client *cc, json_t *sprog)
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{
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json_t *juser, *jcmd, *jenv, *jnetns, *jres;
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struct gtp_daemon *d = cc->d;
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const char *cmd, *user;
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char **addl_env = NULL;
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sigset_t oldmask;
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int nsfd = -1, rc;
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juser = json_object_get(sprog, "run_as_user");
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jcmd = json_object_get(sprog, "command");
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jenv = json_object_get(sprog, "environment");
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jnetns = json_object_get(sprog, "tun_netns_name");
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/* mandatory parts */
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if (!juser || !jcmd)
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return -EINVAL;
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if (!json_is_string(juser) || !json_is_string(jcmd))
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return -EINVAL;
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/* optional parts */
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if (jenv && !json_is_array(jenv))
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return -EINVAL;
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if (jnetns && !json_is_string(jnetns))
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return -EINVAL;
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cmd = json_string_value(jcmd);
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user = json_string_value(juser);
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if (jnetns) {
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struct tun_device *tun = tun_device_find_netns(d, json_string_value(jnetns));
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if (!tun)
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return -ENODEV;
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nsfd = tun->netns_fd;
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}
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/* build environment */
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if (jenv) {
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json_t *j;
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int i;
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addl_env = talloc_zero_array(cc, char *, json_array_size(jenv)+1);
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if (!addl_env)
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return -ENOMEM;
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json_array_foreach(jenv, i, j) {
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addl_env[i] = talloc_strdup(addl_env, json_string_value(j));
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}
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}
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if (jnetns) {
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rc = switch_ns(nsfd, &oldmask);
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if (rc < 0) {
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talloc_free(addl_env);
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return -EIO;
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}
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}
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rc = osmo_system_nowait2(cmd, osmo_environment_whitelist, addl_env, user);
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if (jnetns) {
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OSMO_ASSERT(restore_ns(&oldmask) == 0);
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}
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talloc_free(addl_env);
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if (rc > 0) {
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/* create a record about the subprocess we started, so we can notify the
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* client that crated it upon termination */
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struct subprocess *sproc = talloc_zero(cc, struct subprocess);
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if (!sproc)
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return -ENOMEM;
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sproc->cups_client = cc;
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sproc->pid = rc;
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llist_add_tail(&sproc->list, &d->subprocesses);
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jres = gen_uecups_start_res(sproc->pid, "OK");
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} else {
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jres = gen_uecups_start_res(0, "ERR_INVALID_DATA");
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}
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cups_client_tx_json(cc, jres);
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return 0;
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}
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static int cups_client_handle_reset_all_state(struct cups_client *cc, json_t *sprog)
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{
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struct gtp_daemon *d = cc->d;
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struct gtp_tunnel *t, *t2;
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struct subprocess *p, *p2;
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json_t *jres;
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LOGCC(cc, LOGL_DEBUG, "Destroying all tunnels\n");
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pthread_rwlock_wrlock(&d->rwlock);
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llist_for_each_entry_safe(t, t2, &d->gtp_tunnels, list) {
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_gtp_tunnel_destroy(t);
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}
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pthread_rwlock_unlock(&d->rwlock);
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/* no locking needed as this list is only used by main thread */
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LOGCC(cc, LOGL_DEBUG, "Destroying all subprocesses\n");
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llist_for_each_entry_safe(p, p2, &d->subprocesses, list) {
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subprocess_destroy(p, SIGKILL);
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}
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if (d->reset_all_state_tun_remaining == 0) {
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jres = gen_uecups_result("reset_all_state_res", "OK");
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cups_client_tx_json(cc, jres);
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} else {
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cc->reset_all_state_res_pending = true;
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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 if (!strcmp(key, "start_program")) {
|
|
rc = cups_client_handle_start_program(cc, cmd);
|
|
} else if (!strcmp(key, "reset_all_state")) {
|
|
rc = cups_client_handle_reset_all_state(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);
|
|
struct gtp_daemon *d = cc->d;
|
|
struct subprocess *p, *p2;
|
|
|
|
/* kill + forget about all subprocesses of this client */
|
|
/* We need no locking here as the subprocess list is only used from the main thread */
|
|
llist_for_each_entry_safe(p, p2, &d->subprocesses, list) {
|
|
if (p->cups_client == cc)
|
|
subprocess_destroy(p, SIGKILL);
|
|
}
|
|
|
|
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;
|
|
|
|
cc->d = d;
|
|
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;
|
|
}
|
|
|
|
struct osmo_stream_srv_link *cups_srv_link_create(struct gtp_daemon *d)
|
|
{
|
|
struct osmo_stream_srv_link *srv_link;
|
|
srv_link = osmo_stream_srv_link_create(g_daemon);
|
|
if (!srv_link)
|
|
return NULL;
|
|
|
|
/* UECUPS socket for control from control plane side */
|
|
osmo_stream_srv_link_set_nodelay(srv_link, true);
|
|
osmo_stream_srv_link_set_addr(srv_link, g_daemon->cfg.cups_local_ip);
|
|
osmo_stream_srv_link_set_port(srv_link, g_daemon->cfg.cups_local_port);
|
|
osmo_stream_srv_link_set_proto(srv_link, IPPROTO_SCTP);
|
|
osmo_stream_srv_link_set_data(srv_link, g_daemon);
|
|
osmo_stream_srv_link_set_accept_cb(srv_link, cups_accept_cb);
|
|
osmo_stream_srv_link_open(srv_link);
|
|
return srv_link;
|
|
}
|