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openggsn/ggsn/ggsn.c

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/*
* OpenGGSN - Gateway GPRS Support Node
* Copyright (C) 2002, 2003, 2004 Mondru AB.
*
* The contents of this file may be used under the terms of the GNU
* General Public License Version 2, provided that the above copyright
* notice and this permission notice is included in all copies or
* substantial portions of the software.
*
*/
/* ggsn.c
*
*/
#ifdef __linux__
#define _GNU_SOURCE 1 /* strdup() prototype, broken arpa/inet.h */
#endif
#include "../config.h"
#include <osmocom/core/application.h>
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#include <ctype.h>
#include <netdb.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <arpa/inet.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <inttypes.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/if.h>
#include <errno.h>
#include <time.h>
#include <osmocom/core/select.h>
#include <osmocom/ctrl/control_if.h>
#include <osmocom/ctrl/control_cmd.h>
#include <osmocom/ctrl/ports.h>
#include "../lib/tun.h"
#include "../lib/ippool.h"
#include "../lib/syserr.h"
#include "../lib/in46_addr.h"
#include "../gtp/pdp.h"
#include "../gtp/gtp.h"
#include "cmdline.h"
#include "gtp-kernel.h"
#include "icmpv6.h"
int end = 0;
int maxfd = 0; /* For select() */
struct in_addr listen_;
struct in46_addr netaddr, destaddr, net; /* Network interface */
size_t prefixlen;
struct in46_addr dns1, dns2; /* PCO DNS address */
char *ipup, *ipdown; /* Filename of scripts */
int debug; /* Print debug output */
struct ul255_t pco;
struct ul255_t qos;
struct ul255_t apn;
struct gsn_t *gsn; /* GSN instance */
struct tun_t *tun; /* TUN instance */
struct ippool_t *ippool; /* Pool of IP addresses */
/* To exit gracefully. Used with GCC compilation flag -pg and gprof */
void signal_handler(int s)
{
DEBUGP(DGGSN, "Received signal %d, exiting.\n", s);
end = 1;
}
/* Used to write process ID to file. Assume someone else will delete */
void log_pid(char *pidfile)
{
FILE *file;
mode_t oldmask;
oldmask = umask(022);
file = fopen(pidfile, "w");
umask(oldmask);
if (!file) {
SYS_ERR(DGGSN, LOGL_ERROR, 0,
"Failed to create process ID file: %s!", pidfile);
return;
}
fprintf(file, "%d\n", (int)getpid());
fclose(file);
}
#if defined(__sun__)
int daemon(int nochdir, int noclose)
{
int fd;
switch (fork()) {
case -1:
return (-1);
case 0:
break;
default:
_exit(0);
}
if (setsid() == -1)
return (-1);
if (!nochdir)
chdir("/");
if (!noclose && (fd = open("/dev/null", O_RDWR, 0)) != -1) {
dup2(fd, STDIN_FILENO);
dup2(fd, STDOUT_FILENO);
dup2(fd, STDERR_FILENO);
if (fd > 2)
close(fd);
}
return (0);
}
#endif
static bool send_trap(const struct gsn_t *gsn, const struct pdp_t *pdp, const struct ippoolm_t *member, const char *var)
{
char addrbuf[256];
char val[NAMESIZE];
const char *addrstr = in46a_ntop(&member->addr, addrbuf, sizeof(addrbuf));
snprintf(val, sizeof(val), "%s,%s", imsi_gtp2str(&pdp->imsi), addrstr);
if (ctrl_cmd_send_trap(gsn->priv, var, val) < 0) {
LOGP(DGGSN, LOGL_ERROR, "Failed to create and send TRAP for IMSI %" PRIu64 " [%s].\n", pdp->imsi, var);
return false;
}
return true;
}
int delete_context(struct pdp_t *pdp)
{
DEBUGP(DGGSN, "Deleting PDP context\n");
struct ippoolm_t *member = pdp->peer;
if (pdp->peer) {
send_trap(gsn, pdp, member, "imsi-rem-ip"); /* TRAP with IP removal */
ippool_freeip(ippool, (struct ippoolm_t *)pdp->peer);
} else
SYS_ERR(DGGSN, LOGL_ERROR, 0, "Peer not defined!");
if (gtp_kernel_tunnel_del(pdp)) {
SYS_ERR(DGGSN, LOGL_ERROR, 0,
"Cannot delete tunnel from kernel: %s\n",
strerror(errno));
}
return 0;
}
#include <osmocom/gsm/tlv.h>
/* 3GPP TS 24.008 10.6.5.3 */
enum pco_protocols {
PCO_P_LCP = 0xC021,
PCO_P_PAP = 0xC023,
PCO_P_CHAP = 0xC223,
PCO_P_IPCP = 0x8021,
PCO_P_PCSCF_ADDR = 0x0001,
PCO_P_IM_CN_SS_F = 0x0002,
PCO_P_DNS_IPv6_ADDR = 0x0003,
PCO_P_POLICY_CTRL_REJ = 0x0004, /* only in Network->MS */
PCO_P_MS_SUP_NETREQ_BCI = 0x0005,
/* reserved */
PCO_P_DSMIPv6_HA_ADDR = 0x0007,
PCO_P_DSMIPv6_HN_PREF = 0x0008,
PCO_P_DSMIPv6_v4_HA_ADDR= 0x0009,
PCO_P_IP_ADDR_VIA_NAS = 0x000a, /* only MS->Network */
PCO_P_IPv4_ADDR_VIA_DHCP= 0x000b, /* only MS->Netowrk */
PCO_P_PCSCF_IPv4_ADDR = 0x000c,
PCO_P_DNS_IPv4_ADDR = 0x000d,
PCO_P_MSISDN = 0x000e,
PCO_P_IFOM_SUPPORT = 0x000f,
PCO_P_IPv4_LINK_MTU = 0x0010,
PCO_P_MS_SUPP_LOC_A_TFT = 0x0011,
PCO_P_PCSCF_RESEL_SUP = 0x0012, /* only MS->Network */
PCO_P_NBIFOM_REQ = 0x0013,
PCO_P_NBIFOM_MODE = 0x0014,
PCO_P_NONIP_LINK_MTU = 0x0015,
PCO_P_APN_RATE_CTRL_SUP = 0x0016,
PCO_P_PS_DATA_OFF_UE = 0x0017,
PCO_P_REL_DATA_SVC = 0x0018,
};
/* determine if PCO contains given protocol */
static bool pco_contains_proto(struct ul255_t *pco, uint16_t prot)
{
uint8_t *cur = pco->v + 1;
/* iterate over PCO and check if protocol contained */
while (cur + 3 <= pco->v + pco->l) {
uint16_t cur_prot = osmo_load16be(cur);
uint8_t cur_len = cur[2];
if (cur_prot == prot)
return true;
if (cur_len == 0)
break;
cur += cur_len + 3;
}
return false;
}
/* determine if PDP context has IPv6 support */
static bool pdp_has_v4(struct pdp_t *pdp)
{
if (pdp->eua.l == 4+2)
return true;
else
return false;
}
/* process one PCO request from a MS/UE, putting together the proper responses */
static void process_pco(struct pdp_t *pdp)
{
struct msgb *msg = msgb_alloc(256, "PCO");
msgb_put_u8(msg, 0x80); /* ext-bit + configuration protocol byte */
/* FIXME: also check if primary / secondary DNS was requested */
if (pdp_has_v4(pdp) && pco_contains_proto(&pdp->pco_req, PCO_P_IPCP)) {
/* FIXME: properly implement this for IPCP */
uint8_t *cur = msgb_put(msg, pco.l-1);
memcpy(cur, pco.v+1, pco.l-1);
}
if (pco_contains_proto(&pdp->pco_req, PCO_P_DNS_IPv6_ADDR)) {
if (dns1.len == 16)
msgb_t16lv_put(msg, PCO_P_DNS_IPv6_ADDR, dns1.len, dns1.v6.s6_addr);
if (dns2.len == 16)
msgb_t16lv_put(msg, PCO_P_DNS_IPv6_ADDR, dns2.len, dns2.v6.s6_addr);
}
if (pco_contains_proto(&pdp->pco_req, PCO_P_DNS_IPv4_ADDR)) {
if (dns1.len == 4)
msgb_t16lv_put(msg, PCO_P_DNS_IPv4_ADDR, dns1.len, (uint8_t *)&dns1.v4);
if (dns2.len == 4)
msgb_t16lv_put(msg, PCO_P_DNS_IPv4_ADDR, dns2.len, (uint8_t *)&dns2.v4);
}
if (msgb_length(msg) > 1) {
memcpy(pdp->pco_neg.v, msgb_data(msg), msgb_length(msg));
pdp->pco_neg.l = msgb_length(msg);
} else
pdp->pco_neg.l = 0;
msgb_free(msg);
}
int create_context_ind(struct pdp_t *pdp)
{
struct in46_addr addr;
struct ippoolm_t *member;
int rc;
DEBUGP(DGGSN, "Received create PDP context request\n");
/* FIXME: we manually force all context requests to dynamic here! */
if (pdp->eua.l > 2)
pdp->eua.l = 2;
memcpy(pdp->qos_neg0, pdp->qos_req0, sizeof(pdp->qos_req0));
memcpy(pdp->qos_neg.v, pdp->qos_req.v, pdp->qos_req.l); /* TODO */
pdp->qos_neg.l = pdp->qos_req.l;
if (in46a_from_eua(&pdp->eua, &addr)) {
SYS_ERR(DGGSN, LOGL_ERROR, 0, "Cannot decode EUA from MS/SGSN: %s",
osmo_hexdump(pdp->eua.v, pdp->eua.l));
gtp_create_context_resp(gsn, pdp, GTPCAUSE_UNKNOWN_PDP);
return 0;
}
rc = ippool_newip(ippool, &member, &addr, 0);
if (rc < 0) {
SYS_ERR(DGGSN, LOGL_ERROR, 0, "Cannot allocate IP address in pool\n");
gtp_create_context_resp(gsn, pdp, -rc);
return 0; /* Allready in use, or no more available */
}
if (addr.len == sizeof(struct in6_addr)) {
struct in46_addr tmp;
/* IPv6 doesn't really send the real/allocated address at this point, but just
* the link-identifier which the MS shall use for router solicitation */
tmp.len = addr.len;
/* initialize upper 64 bits to prefix, they are discarded by MS anyway */
memcpy(tmp.v6.s6_addr, &member->addr.v6, 8);
/* use allocated 64bit prefix as lower 64bit, used as link id by MS */
memcpy(tmp.v6.s6_addr+8, &member->addr.v6, 8);
in46a_to_eua(&tmp, &pdp->eua);
} else
in46a_to_eua(&member->addr, &pdp->eua);
pdp->peer = member;
pdp->ipif = tun; /* TODO */
member->peer = pdp;
/* TODO: In IPv6, EUA doesn't contain the actual IP addr/prefix! */
if (gtp_kernel_tunnel_add(pdp) < 0) {
SYS_ERR(DGGSN, LOGL_ERROR, 0,
"Cannot add tunnel to kernel: %s\n", strerror(errno));
gtp_create_context_resp(gsn, pdp, GTPCAUSE_SYS_FAIL);
return 0;
}
if (!send_trap(gsn, pdp, member, "imsi-ass-ip")) { /* TRAP with IP assignment */
gtp_create_context_resp(gsn, pdp, GTPCAUSE_NO_RESOURCES);
return 0;
}
process_pco(pdp);
gtp_create_context_resp(gsn, pdp, GTPCAUSE_ACC_REQ);
return 0; /* Success */
}
/* Callback for receiving messages from tun */
int cb_tun_ind(struct tun_t *tun, void *pack, unsigned len)
{
struct ippoolm_t *ipm;
struct in46_addr dst;
struct iphdr *iph = (struct iphdr *)pack;
struct ip6_hdr *ip6h = (struct ip6_hdr *)pack;
if (iph->version == 4) {
if (len < sizeof(*iph) || len < 4*iph->ihl)
return -1;
dst.len = 4;
dst.v4.s_addr = iph->daddr;
} else if (iph->version == 6) {
/* Due to the fact that 3GPP requires an allocation of a
* /64 prefix to each MS, we must instruct
* ippool_getip() below to match only the leading /64
* prefix, i.e. the first 8 bytes of the address */
dst.len = 8;
dst.v6 = ip6h->ip6_dst;
} else {
LOGP(DGGSN, LOGL_NOTICE, "non-IPv packet received from tun\n");
return -1;
}
DEBUGP(DGGSN, "Received packet from tun!\n");
if (ippool_getip(ippool, &ipm, &dst)) {
DEBUGP(DGGSN, "Received packet with no destination!!!\n");
return 0;
}
if (ipm->peer) /* Check if a peer protocol is defined */
gtp_data_req(gsn, (struct pdp_t *)ipm->peer, pack, len);
return 0;
}
/* RFC3307 link-local scope multicast address */
static const struct in6_addr all_router_mcast_addr = {
.s6_addr = { 0xff,0x02,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,2 }
};
int encaps_tun(struct pdp_t *pdp, void *pack, unsigned len)
{
struct iphdr *iph = (struct iphdr *)pack;
struct ip6_hdr *ip6h = (struct ip6_hdr *)pack;
DEBUGP(DGGSN, "encaps_tun. Packet received: forwarding to tun\n");
switch (iph->version) {
case 6:
/* daddr: all-routers multicast addr */
if (IN6_ARE_ADDR_EQUAL(&ip6h->ip6_dst, &all_router_mcast_addr))
return handle_router_mcast(gsn, pdp, pack, len);
break;
case 4:
break;
default:
LOGP(DGGSN, LOGL_ERROR, "Packet from MS is neither IPv4 nor IPv6\n");
return -1;
}
return tun_encaps((struct tun_t *)pdp->ipif, pack, len);
}
int main(int argc, char **argv)
{
/* gengeopt declarations */
struct gengetopt_args_info args_info;
struct hostent *host;
/* Handle keyboard interrupt SIGINT */
struct sigaction s;
s.sa_handler = (void *)signal_handler;
if ((0 != sigemptyset(&s.sa_mask)) && debug)
printf("sigemptyset failed.\n");
s.sa_flags = SA_RESETHAND;
if ((sigaction(SIGINT, &s, NULL) != 0) && debug)
printf("Could not register SIGINT signal handler.\n");
fd_set fds; /* For select() */
struct timeval idleTime; /* How long to select() */
int timelimit; /* Number of seconds to be connected */
int starttime; /* Time program was started */
osmo_init_logging(&log_info);
if (cmdline_parser(argc, argv, &args_info) != 0)
exit(1);
if (args_info.debug_flag) {
printf("listen: %s\n", args_info.listen_arg);
if (args_info.conf_arg)
printf("conf: %s\n", args_info.conf_arg);
printf("fg: %d\n", args_info.fg_flag);
printf("debug: %d\n", args_info.debug_flag);
printf("qos: %#08x\n", args_info.qos_arg);
if (args_info.apn_arg)
printf("apn: %s\n", args_info.apn_arg);
if (args_info.net_arg)
printf("net: %s\n", args_info.net_arg);
if (args_info.dynip_arg)
printf("dynip: %s\n", args_info.dynip_arg);
if (args_info.statip_arg)
printf("statip: %s\n", args_info.statip_arg);
if (args_info.ipup_arg)
printf("ipup: %s\n", args_info.ipup_arg);
if (args_info.ipdown_arg)
printf("ipdown: %s\n", args_info.ipdown_arg);
if (args_info.pidfile_arg)
printf("pidfile: %s\n", args_info.pidfile_arg);
if (args_info.statedir_arg)
printf("statedir: %s\n", args_info.statedir_arg);
if (args_info.gtp_linux_flag)
printf("gtp_linux: %d\n", args_info.gtp_linux_flag);
printf("timelimit: %d\n", args_info.timelimit_arg);
}
/* Try out our new parser */
if (cmdline_parser_configfile(args_info.conf_arg, &args_info, 0, 0, 0)
!= 0)
exit(1);
/* Open a log file */
if (args_info.logfile_arg) {
struct log_target *tgt;
int lvl;
tgt = log_target_find(LOG_TGT_TYPE_FILE, args_info.logfile_arg);
if (!tgt) {
tgt = log_target_create_file(args_info.logfile_arg);
if (!tgt) {
LOGP(DGGSN, LOGL_ERROR,
"Failed to create logfile: %s\n",
args_info.logfile_arg);
exit(1);
}
log_add_target(tgt);
}
log_set_all_filter(tgt, 1);
log_set_use_color(tgt, 0);
if (args_info.loglevel_arg) {
lvl = log_parse_level(args_info.loglevel_arg);
log_set_log_level(tgt, lvl);
LOGP(DGGSN, LOGL_NOTICE,
"Set file log level to %s\n",
log_level_str(lvl));
}
}
if (args_info.debug_flag) {
printf("cmdline_parser_configfile\n");
printf("listen: %s\n", args_info.listen_arg);
printf("conf: %s\n", args_info.conf_arg);
printf("fg: %d\n", args_info.fg_flag);
printf("debug: %d\n", args_info.debug_flag);
printf("qos: %#08x\n", args_info.qos_arg);
if (args_info.apn_arg)
printf("apn: %s\n", args_info.apn_arg);
if (args_info.net_arg)
printf("net: %s\n", args_info.net_arg);
if (args_info.dynip_arg)
printf("dynip: %s\n", args_info.dynip_arg);
if (args_info.statip_arg)
printf("statip: %s\n", args_info.statip_arg);
if (args_info.ipup_arg)
printf("ipup: %s\n", args_info.ipup_arg);
if (args_info.ipdown_arg)
printf("ipdown: %s\n", args_info.ipdown_arg);
if (args_info.pidfile_arg)
printf("pidfile: %s\n", args_info.pidfile_arg);
if (args_info.statedir_arg)
printf("statedir: %s\n", args_info.statedir_arg);
if (args_info.gtp_linux_flag)
printf("gtp-linux: %d\n", args_info.gtp_linux_flag);
printf("timelimit: %d\n", args_info.timelimit_arg);
}
/* Handle each option */
/* debug */
debug = args_info.debug_flag;
/* listen */
/* Do hostname lookup to translate hostname to IP address */
/* Any port listening is not possible as a valid address is */
/* required for create_pdp_context_response messages */
if (args_info.listen_arg) {
if (!(host = gethostbyname(args_info.listen_arg))) {
SYS_ERR(DGGSN, LOGL_ERROR, 0,
"Invalid listening address: %s!",
args_info.listen_arg);
exit(1);
} else {
memcpy(&listen_.s_addr, host->h_addr, host->h_length);
}
} else {
SYS_ERR(DGGSN, LOGL_ERROR, 0,
"Listening address must be specified! "
"Please use command line option --listen or "
"edit %s configuration file\n", args_info.conf_arg);
exit(1);
}
/* net */
/* Store net as in_addr net and mask */
if (args_info.net_arg) {
if (ippool_aton(&net, &prefixlen, args_info.net_arg, 0)) {
SYS_ERR(DGGSN, LOGL_ERROR, 0,
"Invalid network address: %s!",
args_info.net_arg);
exit(1);
}
/* default for network + destination address = net + 1 */
netaddr = net;
in46a_inc(&netaddr);
destaddr = netaddr;
} else {
SYS_ERR(DGGSN, LOGL_ERROR, 0,
"Network address must be specified: %s!",
args_info.net_arg);
exit(1);
}
/* dynip */
struct in46_prefix i46p;
size_t prefixlen;
if (!args_info.dynip_arg) {
if (ippool_aton(&i46p.addr, &prefixlen, args_info.net_arg, 0)) {
SYS_ERR(DIP, LOGL_ERROR, 0, "Failed to parse dynamic pool");
exit(1);
}
} else {
if (ippool_aton(&i46p.addr, &prefixlen, args_info.dynip_arg, 0)) {
SYS_ERR(DIP, LOGL_ERROR, 0, "Failed to parse dynamic pool");
exit(1);
}
}
i46p.prefixlen = prefixlen;
if (ippool_new(&ippool, &i46p, NULL, IPPOOL_NONETWORK | IPPOOL_NOGATEWAY | IPPOOL_NOBROADCAST)) {
SYS_ERR(DGGSN, LOGL_ERROR, 0, "Failed to allocate IP pool!");
exit(1);
}
/* DNS1 and DNS2 */
memset(&dns1, 0, sizeof(dns1));
if (args_info.pcodns1_arg) {
size_t tmp;
if (ippool_aton(&dns1, &tmp, args_info.pcodns1_arg, 0) != 0) {
SYS_ERR(DGGSN, LOGL_ERROR, 0,
"Failed to convert pcodns1!");
exit(1);
}
}
memset(&dns2, 0, sizeof(dns2));
if (args_info.pcodns2_arg) {
size_t tmp;
if (ippool_aton(&dns2, &tmp, args_info.pcodns2_arg, 0) != 0) {
SYS_ERR(DGGSN, LOGL_ERROR, 0,
"Failed to convert pcodns2!");
exit(1);
}
}
unsigned int cur = 0;
pco.v[cur++] = 0x80; /* x0000yyy x=1, yyy=000: PPP */
pco.v[cur++] = 0x80; /* IPCP */
pco.v[cur++] = 0x21;
pco.v[cur++] = 0xFF; /* Length of contents */
pco.v[cur++] = 0x02; /* ACK */
pco.v[cur++] = 0x00; /* ID: Need to match request */
pco.v[cur++] = 0x00; /* Length */
pco.v[cur++] = 0xFF; /* overwritten */
if (dns1.len == 4) {
pco.v[cur++] = 0x81; /* DNS 1 */
pco.v[cur++] = 2 + dns1.len;
if (dns1.len == 4)
memcpy(&pco.v[cur], &dns1.v4, dns1.len);
else
memcpy(&pco.v[cur], &dns1.v6, dns1.len);
cur += dns1.len;
}
if (dns2.len == 4) {
pco.v[cur++] = 0x83;
pco.v[cur++] = 2 + dns2.len; /* DNS 2 */
if (dns2.len == 4)
memcpy(&pco.v[cur], &dns2.v4, dns2.len);
else
memcpy(&pco.v[cur], &dns2.v6, dns2.len);
cur += dns2.len;
}
pco.l = cur;
/* patch in length values */
pco.v[3] = pco.l - 4;
pco.v[7] = pco.l - 4;
/* ipup */
ipup = args_info.ipup_arg;
/* ipdown */
ipdown = args_info.ipdown_arg;
/* Timelimit */
timelimit = args_info.timelimit_arg;
starttime = time(NULL);
/* qos */
qos.l = 3;
qos.v[2] = (args_info.qos_arg) & 0xff;
qos.v[1] = ((args_info.qos_arg) >> 8) & 0xff;
qos.v[0] = ((args_info.qos_arg) >> 16) & 0xff;
/* apn */
if (strlen(args_info.apn_arg) > (sizeof(apn.v) - 1)) {
LOGP(DGGSN, LOGL_ERROR, "Invalid APN\n");
return -1;
}
apn.l = strlen(args_info.apn_arg) + 1;
apn.v[0] = (char)strlen(args_info.apn_arg);
strncpy((char *)&apn.v[1], args_info.apn_arg, sizeof(apn.v) - 1);
/* foreground */
/* If flag not given run as a daemon */
if (!args_info.fg_flag) {
FILE *f;
int rc;
/* Close the standard file descriptors. */
/* Is this really needed ? */
f = freopen("/dev/null", "w", stdout);
if (f == NULL) {
SYS_ERR(DGGSN, LOGL_NOTICE, 0,
"Could not redirect stdout to /dev/null");
}
f = freopen("/dev/null", "w", stderr);
if (f == NULL) {
SYS_ERR(DGGSN, LOGL_NOTICE, 0,
"Could not redirect stderr to /dev/null");
}
f = freopen("/dev/null", "r", stdin);
if (f == NULL) {
SYS_ERR(DGGSN, LOGL_NOTICE, 0,
"Could not redirect stdin to /dev/null");
}
rc = daemon(0, 0);
if (rc != 0) {
SYS_ERR(DGGSN, LOGL_ERROR, rc,
"Could not daemonize");
exit(1);
}
}
/* pidfile */
/* This has to be done after we have our final pid */
if (args_info.pidfile_arg) {
log_pid(args_info.pidfile_arg);
}
DEBUGP(DGGSN, "gtpclient: Initialising GTP tunnel\n");
if (gtp_new(&gsn, args_info.statedir_arg, &listen_, GTP_MODE_GGSN)) {
SYS_ERR(DGGSN, LOGL_ERROR, 0, "Failed to create gtp");
exit(1);
}
if (gsn->fd0 > maxfd)
maxfd = gsn->fd0;
if (gsn->fd1c > maxfd)
maxfd = gsn->fd1c;
if (gsn->fd1u > maxfd)
maxfd = gsn->fd1u;
/* use GTP kernel module for data packet encapsulation */
if (args_info.gtp_linux_given) {
if (gtp_kernel_init(gsn, &net.v4, prefixlen, args_info.net_arg) < 0) {
SYS_ERR(DGGSN, LOGL_ERROR, 0, "Failed to initialize kernel GTP\n");
goto err;
}
}
gtp_set_cb_data_ind(gsn, encaps_tun);
gtp_set_cb_delete_context(gsn, delete_context);
gtp_set_cb_create_context_ind(gsn, create_context_ind);
gsn->priv = ctrl_interface_setup(NULL, OSMO_CTRL_PORT_GGSN, NULL);
if (!gsn->priv) {
LOGP(DGGSN, LOGL_ERROR, "Failed to create CTRL interface.\n");
exit(1);
}
/* skip the configuration of the tun0 if we're using the gtp0 device */
if (gtp_kernel_enabled())
goto skip_tun;
/* Create a tunnel interface */
DEBUGP(DGGSN, "Creating tun interface\n");
if (tun_new((struct tun_t **)&tun)) {
SYS_ERR(DGGSN, LOGL_ERROR, 0, "Failed to create tun");
exit(1);
}
DEBUGP(DGGSN, "Setting tun IP address\n");
if (tun_setaddr(tun, &netaddr, &destaddr, prefixlen)) {
SYS_ERR(DGGSN, LOGL_ERROR, 0, "Failed to set tun IP address");
exit(1);
}
tun_set_cb_ind(tun, cb_tun_ind);
if (tun->fd > maxfd)
maxfd = tun->fd;
if (ipup)
tun_runscript(tun, ipup);
skip_tun:
/******************************************************************/
/* Main select loop */
/******************************************************************/
while ((((starttime + timelimit) > time(NULL)) || (0 == timelimit))
&& (!end)) {
FD_ZERO(&fds);
if (tun)
FD_SET(tun->fd, &fds);
FD_SET(gsn->fd0, &fds);
FD_SET(gsn->fd1c, &fds);
FD_SET(gsn->fd1u, &fds);
gtp_retranstimeout(gsn, &idleTime);
switch (select(maxfd + 1, &fds, NULL, NULL, &idleTime)) {
case -1: /* errno == EINTR : unblocked signal */
SYS_ERR(DGGSN, LOGL_ERROR, 0,
"select() returned -1");
/* On error, select returns without modifying fds */
FD_ZERO(&fds);
break;
case 0:
/* printf("Select returned 0\n"); */
gtp_retrans(gsn); /* Only retransmit if nothing else */
break;
default:
break;
}
if (tun && tun->fd != -1 && FD_ISSET(tun->fd, &fds) &&
tun_decaps(tun) < 0) {
SYS_ERR(DGGSN, LOGL_ERROR, 0,
"TUN read failed (fd)=(%d)", tun->fd);
}
if (FD_ISSET(gsn->fd0, &fds))
gtp_decaps0(gsn);
if (FD_ISSET(gsn->fd1c, &fds))
gtp_decaps1c(gsn);
if (FD_ISSET(gsn->fd1u, &fds))
gtp_decaps1u(gsn);
osmo_select_main(1);
}
err:
gtp_kernel_stop();
cmdline_parser_free(&args_info);
ippool_free(ippool);
gtp_free(gsn);
if (tun)
tun_free(tun);
return 1;
}
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