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osmo-uecups
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Move several objects outside of main.c 

This makes it far more easy to understand the data model and find stuff
in code.

Change-Id: I4613361dc40518edd94f2d4128ba412337690736
This commit is contained in:
Pau Espin 2022-04-12 12:34:25 +02:00
parent afa22c6fef
commit f9f5b301dd
5 changed files with 726 additions and 659 deletions
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2
daemon/Makefile.am
View File

@ -36,10 +36,12 @@ bin_PROGRAMS = \
$(NULL)
osmo_uecups_daemon_SOURCES = \
cups_client.c \
utility.c \
netdev.c \
netns.c \
tun_device.c \
gtp_daemon.c \
gtp_endpoint.c \
gtp_tunnel.c \
daemon_vty.c \

612
daemon/cups_client.c Normal file
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@ -0,0 +1,612 @@
/* 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 <errno.h>
#include <pthread.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/exec.h>
#include "internal.h"
#include <netinet/sctp.h>
/***********************************************************************
* Client (Control/User Plane Separation) Socket
***********************************************************************/
#define CUPS_MSGB_SIZE 1024
#define LOGCC(cc, lvl, fmt, args ...) \
LOGP(DUECUPS, lvl, "%s: " fmt, (cc)->sockname, ## args)
struct subprocess {
/* member in daemon->cups_clients */
struct llist_head list;
/* pointer to the client that started us */
struct cups_client *cups_client;
/* PID of the process */
pid_t pid;
};
static json_t *gen_uecups_term_ind(pid_t pid, int status);
/* kill the specified subprocess and forget about it */
static void subprocess_destroy(struct subprocess *p, int signal)
{
LOGCC(p->cups_client, LOGL_DEBUG, "Kill subprocess pid %llu with signal %u\n",
(unsigned long long)p->pid, signal);
kill(p->pid, signal);
llist_del(&p->list);
talloc_free(p);
}
static struct subprocess *subprocess_by_pid(struct gtp_daemon *d, pid_t pid)
{
struct subprocess *sproc;
llist_for_each_entry(sproc, &d->subprocesses, list) {
if (sproc->pid == pid)
return sproc;
}
return NULL;
}
void child_terminated(struct gtp_daemon *d, int pid, int status)
{
struct subprocess *sproc;
json_t *jterm_ind;
LOGP(DUECUPS, LOGL_DEBUG, "SIGCHLD receive from pid %u; status=%d\n", pid, status);
sproc = subprocess_by_pid(d, pid);
if (!sproc) {
LOGP(DUECUPS, LOGL_NOTICE, "subprocess %u terminated (status=%d) but we don't know it?\n",
pid, status);
return;
}
/* generate prog_term_ind towards control plane */
jterm_ind = gen_uecups_term_ind(pid, status);
if (!jterm_ind)
return;
cups_client_tx_json(sproc->cups_client, jterm_ind);
llist_del(&sproc->list);
talloc_free(sproc);
}
/* Send JSON to a given client/connection */
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;
}
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 json_t *gen_uecups_term_ind(pid_t pid, int status)
{
json_t *jterm = json_object();
json_t *jret = json_object();
json_object_set_new(jterm, "pid", json_integer(pid));
json_object_set_new(jterm, "exit_code", json_integer(status));
json_object_set_new(jret, "program_term_ind", jterm);
return jret;
}
static json_t *gen_uecups_start_res(pid_t pid, const char *result)
{
json_t *ret = gen_uecups_result("start_program_res", result);
json_object_set_new(json_object_get(ret, "start_program_res"), "pid", json_integer(pid));
return ret;
}
static int cups_client_handle_start_program(struct cups_client *cc, json_t *sprog)
{
json_t *juser, *jcmd, *jenv, *jnetns, *jres;
struct gtp_daemon *d = cc->d;
const char *cmd, *user;
char **addl_env = NULL;
sigset_t oldmask;
int nsfd = -1, rc;
juser = json_object_get(sprog, "run_as_user");
jcmd = json_object_get(sprog, "command");
jenv = json_object_get(sprog, "environment");
jnetns = json_object_get(sprog, "tun_netns_name");
/* mandatory parts */
if (!juser || !jcmd)
return -EINVAL;
if (!json_is_string(juser) || !json_is_string(jcmd))
return -EINVAL;
/* optional parts */
if (jenv && !json_is_array(jenv))
return -EINVAL;
if (jnetns && !json_is_string(jnetns))
return -EINVAL;
cmd = json_string_value(jcmd);
user = json_string_value(juser);
if (jnetns) {
struct tun_device *tun = tun_device_find_netns(d, json_string_value(jnetns));
if (!tun)
return -ENODEV;
nsfd = tun->netns_fd;
}
/* build environment */
if (jenv) {
json_t *j;
int i;
addl_env = talloc_zero_array(cc, char *, json_array_size(jenv)+1);
if (!addl_env)
return -ENOMEM;
json_array_foreach(jenv, i, j) {
addl_env[i] = talloc_strdup(addl_env, json_string_value(j));
}
}
if (jnetns) {
rc = switch_ns(nsfd, &oldmask);
if (rc < 0) {
talloc_free(addl_env);
return -EIO;
}
}
rc = osmo_system_nowait2(cmd, osmo_environment_whitelist, addl_env, user);
if (jnetns) {
OSMO_ASSERT(restore_ns(&oldmask) == 0);
}
talloc_free(addl_env);
if (rc > 0) {
/* create a record about the subprocess we started, so we can notify the
* client that crated it upon termination */
struct subprocess *sproc = talloc_zero(cc, struct subprocess);
if (!sproc)
return -ENOMEM;
sproc->cups_client = cc;
sproc->pid = rc;
llist_add_tail(&sproc->list, &d->subprocesses);
jres = gen_uecups_start_res(sproc->pid, "OK");
} else {
jres = gen_uecups_start_res(0, "ERR_INVALID_DATA");
}
cups_client_tx_json(cc, jres);
return 0;
}
static int cups_client_handle_reset_all_state(struct cups_client *cc, json_t *sprog)
{
struct gtp_daemon *d = cc->d;
struct gtp_tunnel *t, *t2;
struct subprocess *p, *p2;
json_t *jres;
LOGCC(cc, LOGL_DEBUG, "Destroying all tunnels\n");
pthread_rwlock_wrlock(&d->rwlock);
llist_for_each_entry_safe(t, t2, &d->gtp_tunnels, list) {
_gtp_tunnel_destroy(t);
}
pthread_rwlock_unlock(&d->rwlock);
/* no locking needed as this list is only used by main thread */
LOGCC(cc, LOGL_DEBUG, "Destroying all subprocesses\n");
llist_for_each_entry_safe(p, p2, &d->subprocesses, list) {
subprocess_destroy(p, SIGKILL);
}
if (d->reset_all_state_tun_remaining == 0) {
jres = gen_uecups_result("reset_all_state_res", "OK");
cups_client_tx_json(cc, jres);
} else {
cc->reset_all_state_res_pending = true;
}
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 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;
}

77
daemon/gtp_daemon.c Normal file
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@ -0,0 +1,77 @@
/* 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 <errno.h>
#include <pthread.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/logging.h>
#include "internal.h"
/***********************************************************************
* GTP Daemon
***********************************************************************/
#ifndef OSMO_VTY_PORT_UECUPS
#define OSMO_VTY_PORT_UECUPS 4268
#endif
struct gtp_daemon *g_daemon;
static void gtp_daemon_itq_read_cb(struct osmo_it_q *q, struct llist_head *item)
{
struct gtp_daemon *d = (struct gtp_daemon *)q->data;
struct gtp_daemon_itq_msg *itq_msg = container_of(item, struct gtp_daemon_itq_msg, list);
LOGP(DTUN, LOGL_DEBUG, "Rx new itq message from %s\n",
itq_msg->tun_released.tun->devname);
_tun_device_destroy(itq_msg->tun_released.tun);
if (d->reset_all_state_tun_remaining > 0) {
d->reset_all_state_tun_remaining--;
if (d->reset_all_state_tun_remaining == 0) {
struct cups_client *cc;
llist_for_each_entry(cc, &d->cups_clients, list) {
json_t *jres;
if (!cc->reset_all_state_res_pending)
continue;
cc->reset_all_state_res_pending = false;
jres = gen_uecups_result("reset_all_state_res", "OK");
cups_client_tx_json(cc, jres);
}
}
}
}
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);
INIT_LLIST_HEAD(&d->subprocesses);
pthread_rwlock_init(&d->rwlock, NULL);
d->main_thread = pthread_self();
d->itq = osmo_it_q_alloc(d, "itq", 4096, gtp_daemon_itq_read_cb, d);
osmo_fd_register(&d->itq->event_ofd);
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;
}

29
daemon/internal.h
View File

@ -1,14 +1,22 @@
/* SPDX-License-Identifier: GPL-2.0 */
#pragma once
#include "netns.h"
#include <stdint.h>
#include <stdbool.h>
#include <pthread.h>
#include <sys/socket.h>
#include <jansson.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/write_queue.h>
#include <osmocom/core/it_q.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/socket.h>
#include <osmocom/netif/stream.h>
struct nl_sock;
struct osmo_stream_srv_link;
@ -140,6 +148,25 @@ void _tun_device_deref_release(struct tun_device *tun);
bool tun_device_release(struct tun_device *tun);
/***********************************************************************
* Client (Control/User Plane Separation) Socket
***********************************************************************/
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];
bool reset_all_state_res_pending;
};
struct osmo_stream_srv_link *cups_srv_link_create(struct gtp_daemon *d);
void child_terminated(struct gtp_daemon *d, int pid, int status);
json_t *gen_uecups_result(const char *name, const char *res);
int cups_client_tx_json(struct cups_client *cc, json_t *jtx);
/***********************************************************************
* GTP Tunnel
@ -247,4 +274,6 @@ struct gtp_daemon {
};
extern struct gtp_daemon *g_daemon;
struct gtp_daemon *gtp_daemon_alloc(void *ctx);
int gtpud_vty_init(void);

665
daemon/main.c
View File

@ -24,7 +24,6 @@
#include <osmocom/core/stats.h>
#include <osmocom/core/rate_ctr.h>
#include <osmocom/core/socket.h>
#include <osmocom/core/exec.h>
#include <osmocom/vty/telnet_interface.h>
#include <osmocom/vty/logging.h>
#include <osmocom/vty/stats.h>
@ -33,7 +32,6 @@
#include <osmocom/vty/misc.h>
#include <osmocom/netif/stream.h>
#include <netinet/sctp.h>
#include <jansson.h>
@ -41,330 +39,13 @@
#include "netns.h"
#include "gtp.h"
/***********************************************************************
* Client (Contol/User Plane Separation) Socket
***********************************************************************/
static void *g_tall_ctx;
static char *g_config_file = "osmo-uecups-daemon.cfg";
static int g_daemonize;
extern struct vty_app_info g_vty_info;
#include <pwd.h>
#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];
bool reset_all_state_res_pending;
};
struct subprocess {
/* member in daemon->cups_clients */
struct llist_head list;
/* pointer to the client that started us */
struct cups_client *cups_client;
/* PID of the process */
pid_t pid;
};
/* kill the specified subprocess and forget about it */
static void subprocess_destroy(struct subprocess *p, int signal)
{
LOGCC(p->cups_client, LOGL_DEBUG, "Kill subprocess pid %llu with signal %u\n",
(unsigned long long)p->pid, signal);
kill(p->pid, signal);
llist_del(&p->list);
talloc_free(p);
}
/* 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 json_t *gen_uecups_term_ind(pid_t pid, int status)
{
json_t *jterm = json_object();
json_t *jret = json_object();
json_object_set_new(jterm, "pid", json_integer(pid));
json_object_set_new(jterm, "exit_code", json_integer(status));
json_object_set_new(jret, "program_term_ind", jterm);
return jret;
}
static struct subprocess *subprocess_by_pid(struct gtp_daemon *d, pid_t pid)
{
struct subprocess *sproc;
llist_for_each_entry(sproc, &d->subprocesses, list) {
if (sproc->pid == pid)
return sproc;
}
return NULL;
}
static void child_terminated(struct gtp_daemon *d, int pid, int status)
{
struct subprocess *sproc;
json_t *jterm_ind;
LOGP(DUECUPS, LOGL_DEBUG, "SIGCHLD receive from pid %u; status=%d\n", pid, status);
sproc = subprocess_by_pid(d, pid);
if (!sproc) {
LOGP(DUECUPS, LOGL_NOTICE, "subprocess %u terminated (status=%d) but we don't know it?\n",
pid, status);
return;
}
/* generate prog_term_ind towards control plane */
jterm_ind = gen_uecups_term_ind(pid, status);
if (!jterm_ind)
return;
cups_client_tx_json(sproc->cups_client, jterm_ind);
llist_del(&sproc->list);
talloc_free(sproc);
}
static void sigchild_cb(struct osmo_signalfd *osfd, const struct signalfd_siginfo *fdsi)
{
struct gtp_daemon *d = osfd->data;
@ -385,283 +66,6 @@ static void sigchild_cb(struct osmo_signalfd *osfd, const struct signalfd_siginf
}
static json_t *gen_uecups_start_res(pid_t pid, const char *result)
{
json_t *ret = gen_uecups_result("start_program_res", result);
json_object_set_new(json_object_get(ret, "start_program_res"), "pid", json_integer(pid));
return ret;
}
static int cups_client_handle_start_program(struct cups_client *cc, json_t *sprog)
{
json_t *juser, *jcmd, *jenv, *jnetns, *jres;
struct gtp_daemon *d = cc->d;
const char *cmd, *user;
char **addl_env = NULL;
sigset_t oldmask;
int nsfd = -1, rc;
juser = json_object_get(sprog, "run_as_user");
jcmd = json_object_get(sprog, "command");
jenv = json_object_get(sprog, "environment");
jnetns = json_object_get(sprog, "tun_netns_name");
/* mandatory parts */
if (!juser || !jcmd)
return -EINVAL;
if (!json_is_string(juser) || !json_is_string(jcmd))
return -EINVAL;
/* optional parts */
if (jenv && !json_is_array(jenv))
return -EINVAL;
if (jnetns && !json_is_string(jnetns))
return -EINVAL;
cmd = json_string_value(jcmd);
user = json_string_value(juser);
if (jnetns) {
struct tun_device *tun = tun_device_find_netns(d, json_string_value(jnetns));
if (!tun)
return -ENODEV;
nsfd = tun->netns_fd;
}
/* build environment */
if (jenv) {
json_t *j;
int i;
addl_env = talloc_zero_array(cc, char *, json_array_size(jenv)+1);
if (!addl_env)
return -ENOMEM;
json_array_foreach(jenv, i, j) {
addl_env[i] = talloc_strdup(addl_env, json_string_value(j));
}
}
if (jnetns) {
rc = switch_ns(nsfd, &oldmask);
if (rc < 0) {
talloc_free(addl_env);
return -EIO;
}
}
rc = osmo_system_nowait2(cmd, osmo_environment_whitelist, addl_env, user);
if (jnetns) {
OSMO_ASSERT(restore_ns(&oldmask) == 0);
}
talloc_free(addl_env);
if (rc > 0) {
/* create a record about the subprocess we started, so we can notify the
* client that crated it upon termination */
struct subprocess *sproc = talloc_zero(cc, struct subprocess);
if (!sproc)
return -ENOMEM;
sproc->cups_client = cc;
sproc->pid = rc;
llist_add_tail(&sproc->list, &d->subprocesses);
jres = gen_uecups_start_res(sproc->pid, "OK");
} else {
jres = gen_uecups_start_res(0, "ERR_INVALID_DATA");
}
cups_client_tx_json(cc, jres);
return 0;
}
static int cups_client_handle_reset_all_state(struct cups_client *cc, json_t *sprog)
{
struct gtp_daemon *d = cc->d;
struct gtp_tunnel *t, *t2;
struct subprocess *p, *p2;
json_t *jres;
LOGCC(cc, LOGL_DEBUG, "Destroying all tunnels\n");
pthread_rwlock_wrlock(&d->rwlock);
llist_for_each_entry_safe(t, t2, &d->gtp_tunnels, list) {
_gtp_tunnel_destroy(t);
}
pthread_rwlock_unlock(&d->rwlock);
/* no locking needed as this list is only used by main thread */
LOGCC(cc, LOGL_DEBUG, "Destroying all subprocesses\n");
llist_for_each_entry_safe(p, p2, &d->subprocesses, list) {
subprocess_destroy(p, SIGKILL);
}
if (d->reset_all_state_tun_remaining == 0) {
jres = gen_uecups_result("reset_all_state_res", "OK");
cups_client_tx_json(cc, jres);
} else {
cc->reset_all_state_res_pending = true;
}
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 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;
}
/***********************************************************************
* GTP Daemon
***********************************************************************/
#ifndef OSMO_VTY_PORT_UECUPS
#define OSMO_VTY_PORT_UECUPS 4268
#endif
static void *g_tall_ctx;
struct gtp_daemon *g_daemon;
static int g_daemonize;
static char *g_config_file = "osmo-uecups-daemon.cfg";
extern struct vty_app_info g_vty_info;
static void signal_cb(struct osmo_signalfd *osfd, const struct signalfd_siginfo *fdsi)
{
switch (fdsi->ssi_signo) {
@ -676,55 +80,6 @@ static void signal_cb(struct osmo_signalfd *osfd, const struct signalfd_siginfo
}
}
static void gtp_daemon_itq_read_cb(struct osmo_it_q *q, struct llist_head *item)
{
struct gtp_daemon *d = (struct gtp_daemon *)q->data;
struct gtp_daemon_itq_msg *itq_msg = container_of(item, struct gtp_daemon_itq_msg, list);
LOGP(DTUN, LOGL_DEBUG, "Rx new itq message from %s\n",
itq_msg->tun_released.tun->devname);
_tun_device_destroy(itq_msg->tun_released.tun);
if (d->reset_all_state_tun_remaining > 0) {
d->reset_all_state_tun_remaining--;
if (d->reset_all_state_tun_remaining == 0) {
struct cups_client *cc;
llist_for_each_entry(cc, &d->cups_clients, list) {
json_t *jres;
if (!cc->reset_all_state_res_pending)
continue;
cc->reset_all_state_res_pending = false;
jres = gen_uecups_result("reset_all_state_res", "OK");
cups_client_tx_json(cc, jres);
}
}
}
}
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);
INIT_LLIST_HEAD(&d->subprocesses);
pthread_rwlock_init(&d->rwlock, NULL);
d->main_thread = pthread_self();
d->itq = osmo_it_q_alloc(d, "itq", 4096, gtp_daemon_itq_read_cb, d);
osmo_fd_register(&d->itq->event_ofd);
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",
@ -883,22 +238,14 @@ int main(int argc, char **argv)
if (rc < 0)
exit(1);
g_daemon->cups_link = osmo_stream_srv_link_create(g_daemon);
/* UECUPS socket for control from control plane side */
g_daemon->cups_link = cups_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);
/* block SIGCHLD via normal delivery; redirect it to signalfd */
sigset_t sigset;
sigemptyset(&sigset);