cellular-infrastructure
/
osmo-ggsn
mirror of https://gerrit.osmocom.org/osmo-ggsn
9
0
Fork 0
Code Issues Releases Wiki Activity
osmo-ggsn/gtp/gtp.c

1929 lines
60 KiB
C
Raw Blame History

/*
* OpenGGSN - Gateway GPRS Support Node
* Copyright (C) 2002 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.
*
* The initial developer of the original code is
* Jens Jakobsen <jj@openggsn.org>
*
* Contributor(s):
*
*/
/*
* gtp.c: Contains all GTP functionality. Should be able to handle multiple
* tunnels in the same program.
*
* TODO:
* - Do we need to handle fragmentation?
*/
#ifdef __linux__
#define _GNU_SOURCE 1
#endif
#include <syslog.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/stat.h>
#include <time.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <arpa/inet.h>
#include <stdint.h> /* ISO C99 types */
#include "pdp.h"
#include "gtp.h"
#include "gtpie.h"
#include "queue.h"
struct gtp0_header gtp0_default;
struct gtp1_header_long gtp1_default;
/* API Functions */
const char* gtp_version()
{
return VERSION;
}
/* gtp_new */
/* gtp_free */
int gtp_newpdp(struct gsn_t* gsn, struct pdp_t **pdp,
uint64_t imsi, uint8_t nsapi) {
return pdp_newpdp(pdp, imsi, nsapi, NULL);
}
int gtp_freepdp(struct gsn_t* gsn, struct pdp_t *pdp) {
return pdp_freepdp(pdp);
}
int gtp_create_context(struct gsn_t *gsn, struct pdp_t *pdp, void *aid,
struct in_addr* inetaddr) {
int version = 0;
return gtp_create_pdp_req(gsn, version, aid, inetaddr, pdp);
}
int gtp_update_context(struct gsn_t *gsn, struct pdp_t *pdp, void *aid,
struct in_addr* inetaddr) {
int version = 0;
return gtp_update_pdp_req(gsn, version, aid, inetaddr, pdp);
}
int gtp_delete_context(struct gsn_t *gsn, struct pdp_t *pdp, void *aid) {
int version = 0;
return gtp_delete_pdp_req(gsn, version, aid, pdp);
}
/* gtp_gpdu */
extern int gtp_fd(struct gsn_t *gsn) {
return gsn->fd;
}
/* gtp_decaps */
/* gtp_retrans */
/* gtp_retranstimeout */
int gtp_set_cb_delete_context(struct gsn_t *gsn,
int (*cb_delete_context) (struct pdp_t* pdp))
{
gsn->cb_delete_context = cb_delete_context;
return 0;
}
int gtp_set_cb_create_context(struct gsn_t *gsn,
int (*cb_create_context) (struct pdp_t* pdp))
{
gsn->cb_create_context = cb_create_context;
return 0;
}
/*
int gtp_set_cb_create_pdp_conf(struct gsn_t *gsn,
int (*cb) (struct pdp_t*, int))
{
gsn->cb_create_pdp_conf = cb;
return 0;
}
int gtp_set_cb_update_pdp_conf(struct gsn_t *gsn,
int (*cb) (struct pdp_t*, int, int))
{
gsn->cb_update_pdp_conf = cb;
return 0;
}
in t gtp_set_cb_delete_pdp_conf(struct gsn_t *gsn,
int (*cb) (struct pdp_t*, int))
{
gsn->cb_delete_pdp_conf = cb;
return 0;
}
*/
int gtp_set_cb_conf(struct gsn_t *gsn,
int (*cb) (int type, int cause,
struct pdp_t* pdp, void *aid)) {
gsn->cb_conf = cb;
return 0;
}
extern int gtp_set_cb_gpdu(struct gsn_t *gsn,
int (*cb_gpdu) (struct pdp_t* pdp,
void* pack,
unsigned len))
{
gsn->cb_gpdu = cb_gpdu;
return 0;
}
void get_default_gtp(int version, void *packet) {
switch (version) {
case 0:
memcpy(packet, &gtp0_default, sizeof(gtp0_default));
break;
case 1:
memcpy(packet, &gtp1_default, sizeof(gtp1_default));
break;
}
}
int print_packet(void *packet, unsigned len)
{
int i;
printf("The packet looks like this (%d bytes):\n", len);
for( i=0; i<len; i++) {
printf("%02x ", (unsigned char)*(char *)(packet+i));
if (!((i+1)%16)) printf("\n");
};
printf("\n");
return 0;
}
char* snprint_packet(struct gsn_t *gsn, struct sockaddr_in *peer,
void *pack, unsigned len, char *buf, int size) {
int n;
int pos;
snprintf(buf, size, "Packet from %s:%u, length: %d, content:",
inet_ntoa(peer->sin_addr),
ntohs(peer->sin_port),
len);
buf[size-1] = 0;
pos = strlen(buf);
for(n=0; n<len; n++) {
if ((pos+4)<size) {
sprintf((buf+pos), " %02hhx", ((unsigned char*)pack)[n]);
pos += 3;
}
}
buf[pos] = 0;
return buf;
}
void gtp_err(int priority, char *filename, int linenum, char *fmt, ...) {
va_list args;
char buf[ERRMSG_SIZE];
va_start(args, fmt);
vsnprintf(buf, ERRMSG_SIZE, fmt, args);
va_end(args);
buf[ERRMSG_SIZE-1] = 0;
syslog(priority, "%s: %d: %s", filename, linenum, buf);
}
void gtp_errpack(int pri, char *fn, int ln, struct sockaddr_in *peer,
void *pack, unsigned len, char *fmt, ...) {
va_list args;
char buf[ERRMSG_SIZE];
char buf2[ERRMSG_SIZE];
int n;
int pos;
va_start(args, fmt);
vsnprintf(buf, ERRMSG_SIZE, fmt, args);
va_end(args);
buf[ERRMSG_SIZE-1] = 0;
snprintf(buf2, ERRMSG_SIZE, "Packet from %s:%u, length: %d, content:",
inet_ntoa(peer->sin_addr),
ntohs(peer->sin_port),
len);
buf2[ERRMSG_SIZE-1] = 0;
pos = strlen(buf2);
for(n=0; n<len; n++) {
if ((pos+4)<ERRMSG_SIZE) {
sprintf((buf2+pos), " %02hhx", ((unsigned char*)pack)[n]);
pos += 3;
}
}
buf2[pos] = 0;
syslog(pri, "%s: %d: %s. %s", fn, ln, buf, buf2);
}
/* ***********************************************************
* Reliable delivery of signalling messages
*
* Sequence numbers are used for both signalling messages and
* data messages.
*
* For data messages each tunnel maintains a sequence counter,
* which is incremented by one each time a new data message
* is sent. The sequence number starts at (0) zero at tunnel
* establishment, and wraps around at 65535 (29.060 9.3.1.1
* and 09.60 8.1.1.1). The sequence numbers are either ignored,
* or can be used to check the validity of the message in the
* receiver, or for reordering af packets.
*
* For signalling messages the sequence number is used by
* signalling messages for which a response is defined. A response
* message should copy the sequence from the corresponding request
* message. The sequence number "unambiguously" identifies a request
* message within a given path, with a path being defined as a set of
* two endpoints (29.060 8.2, 29.060 7.6, 09.60 7.8). "All request
* messages shall be responded to, and all response messages associated
* with a certain request shall always include the same information"
*
* We take this to mean that the GSN transmitting a request is free to
* choose the sequence number, as long as it is unique within a given path.
* It means that we are allowed to count backwards, or roll over at 17
* if we prefer that. It also means that we can use the same counter for
* all paths. This has the advantage that the transmitted request sequence
* numbers are unique within each GSN, and also we dont have to mess around
* with path setup and teardown.
*
* If a response message is lost, the request will be retransmitted, and
* the receiving GSN will receive a "duplicated" request. The standard
* requires the receiving GSN to send a response, with the same information
* as in the original response. For most messages this happens automatically:
*
* Echo: Automatically dublicates the original response
* Create pdp context: The SGSN may send create context request even if
* a context allready exist (imsi+nsapi?). This means that the reply will
automatically dublicate the original response. It might however have
* sideeffects in the application which is asked twice to allocate
* validate the login.
* Update pdp context: Automatically dublicates the original response???
* Delete pdp context. Automatically in gtp0, but in gtp1 will generate
* a nonexist reply message.
*
* The correct solution will be to make a queue containing response messages.
* This queue should be checked whenever a request is received. If the
* response is allready in the queue that response should be transmitted.
* It should be possible to find messages in this queue on the basis of
* the sequence number and peer GSN IP address (The sequense number is unique
* within each path). This need to be implemented by a hash table. Furthermore
* it should be possibly to delete messages based on a timeout. This can be
* achieved by means of a linked list. The timeout value need to be larger
* than T3-RESPONSE * N3-REQUESTS (recommended value 5). These timers are
* set in the peer GSN, so there is no way to know these parameters. On the
* other hand the timeout value need to be so small that we do not receive
* wraparound sequence numbere before the message is deleted. 60 seconds is
* probably not a bad choise.
*
* This queue however is first really needed from gtp1.
*
* gtp_req:
* Send off a signalling message with appropiate sequence
* number. Store packet in queue.
* gtp_conf:
* Remove an incoming confirmation from the queue
* gtp_resp:
* Send off a responce to a request. Use the same sequence
* number in the response as in the request.
* gtp_retrans:
* Retransmit any outstanding packets which have exceeded
* a predefined timeout.
*************************************************************/
int gtp_req(struct gsn_t *gsn, int version, union gtp_packet *packet,
int len, struct in_addr *inetaddr, void *aid) {
struct sockaddr_in addr;
struct qmsg_t *qmsg;
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr = *inetaddr;
addr.sin_port = htons(GTP0_PORT);
packet->gtp0.h.seq = hton16(gsn->seq_next);
if (sendto(gsn->fd, packet, len, 0,
(struct sockaddr *) &addr, sizeof(addr)) < 0) {
gsn->err_sendto++;
gtp_err(LOG_ERR, __FILE__, __LINE__, "Sendto(fd=%d, msg=%lx, len=%d) failed: Error = %s", gsn->fd, (unsigned long) &packet, len, strerror(errno));
return -1;
}
/* Use new queue structure */
if (queue_newmsg(gsn->queue_req, &qmsg, &addr, gsn->seq_next)) {
gsn->err_queuefull++;
gtp_err(LOG_ERR, __FILE__, __LINE__, "Retransmit queue is full");
}
else {
memcpy(&qmsg->p, packet, sizeof(union gtp_packet));
qmsg->l = len;
qmsg->timeout = time(NULL) + 3; /* When to timeout */
qmsg->retrans = 0; /* No retransmissions so far */
qmsg->aid = aid;
qmsg->type = ntoh8(packet->gtp0.h.type);
}
gsn->seq_next++; /* Count up this time */
return 0;
}
/* gtp_conf
* Remove signalling packet from retransmission queue.
* return 0 on success, EOF if packet was not found */
int gtp_conf(struct gsn_t *gsn, int version, struct sockaddr_in *peer,
union gtp_packet *packet, int len, uint8_t *type, void **aid) {
int seq = ntoh16(packet->gtp0.h.seq);
if (queue_freemsg_seq(gsn->queue_req, peer, seq, type, aid)) {
gsn->err_seq++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, packet, len,
"Confirmation packet not found in queue");
return EOF;
}
return 0;
}
int gtp_retrans(struct gsn_t *gsn) {
/* Retransmit any outstanding packets */
/* Remove from queue if maxretrans exceeded */
time_t now;
struct qmsg_t *qmsg;
now = time(NULL);
/*printf("Retrans: New beginning %d\n", (int) now);*/
while ((!queue_getfirst(gsn->queue_req, &qmsg)) &&
(qmsg->timeout <= now)) {
/*printf("Retrans timeout found: %d\n", (int) time(NULL));*/
if (qmsg->retrans > 3) { /* To many retrans */
if (gsn->cb_conf) gsn->cb_conf(qmsg->type, EOF, NULL, qmsg->aid);
queue_freemsg(gsn->queue_req, qmsg);
}
else {
if (sendto(gsn->fd, &qmsg->p, qmsg->l, 0,
(struct sockaddr *) &qmsg->peer, sizeof(struct sockaddr_in)) < 0) {
gsn->err_sendto++;
gtp_err(LOG_ERR, __FILE__, __LINE__, "Sendto(fd=%d, msg=%lx, len=%d) failed: Error = %s", gsn->fd, (unsigned long) &qmsg->p, qmsg->l, strerror(errno));
}
queue_back(gsn->queue_req, qmsg);
qmsg->timeout = now + 3;
qmsg->retrans++;
}
}
/* Also clean up reply timeouts */
while ((!queue_getfirst(gsn->queue_resp, &qmsg)) &&
(qmsg->timeout < now)) {
/*printf("Retrans (reply) timeout found: %d\n", (int) time(NULL));*/
queue_freemsg(gsn->queue_resp, qmsg);
}
return 0;
}
int gtp_retranstimeout(struct gsn_t *gsn, struct timeval *timeout) {
time_t now, later;
struct qmsg_t *qmsg;
if (queue_getfirst(gsn->queue_req, &qmsg)) {
timeout->tv_sec = 10;
timeout->tv_usec = 0;
}
else {
now = time(NULL);
later = qmsg->timeout;
timeout->tv_sec = later - now;
timeout->tv_usec = 0;
if (timeout->tv_sec < 0) timeout->tv_sec = 0; /* No negative allowed */
if (timeout->tv_sec > 10) timeout->tv_sec = 10; /* Max sleep for 10 sec*/
}
return 0;
}
int gtp_resp(int version, struct gsn_t *gsn, union gtp_packet *packet,
int len, struct sockaddr_in *peer) {
struct qmsg_t *qmsg;
uint16_t seq;
seq = ntoh16(packet->gtp0.h.seq);
/* print message */
/*
printf("gtp_resp: to %s:UDP%u\n",
inet_ntoa(peer->sin_addr),
ntohs(peer->sin_port));
print_packet(packet, len);
*/
if (sendto(gsn->fd, packet, len, 0,
(struct sockaddr *) peer, sizeof(struct sockaddr_in)) < 0) {
gsn->err_sendto++;
gtp_err(LOG_ERR, __FILE__, __LINE__, "Sendto(fd=%d, msg=%lx, len=%d) failed: Error = %s", gsn->fd, (unsigned long) &packet, len, strerror(errno));
return -1;
}
/* Use new queue structure */
if (queue_newmsg(gsn->queue_resp, &qmsg, peer, seq)) {
gsn->err_queuefull++;
gtp_err(LOG_ERR, __FILE__, __LINE__, "Retransmit queue is full");
}
else {
memcpy(&qmsg->p, packet, sizeof(union gtp_packet));
qmsg->l = len;
qmsg->timeout = time(NULL) + 60; /* When to timeout */
qmsg->retrans = 0; /* No retransmissions so far */
qmsg->aid = NULL;
qmsg->type = 0;
}
return 0;
}
int gtp_dublicate(struct gsn_t *gsn, int version,
struct sockaddr_in *peer, uint16_t seq) {
struct qmsg_t *qmsg;
if(queue_seqget(gsn->queue_resp, &qmsg, peer, seq)) {
return EOF; /* Notfound */
}
else {
/* print message */
/*printf("gtp_dublicate: to %s:UDP%u\n",
inet_ntoa(peer->sin_addr),
ntohs(peer->sin_port));
print_packet(&qmsg->p, qmsg->l);
*/
if (sendto(gsn->fd, &qmsg->p, qmsg->l, 0,
(struct sockaddr *) peer, sizeof(struct sockaddr_in)) < 0) {
gsn->err_sendto++;
gtp_err(LOG_ERR, __FILE__, __LINE__, "Sendto(fd=%d, msg=%lx, len=%d) failed: Error = %s", gsn->fd, (unsigned long) &qmsg->p, qmsg->l, strerror(errno));
}
return 0;
}
}
/* Perform restoration and recovery error handling as described in 29.060 */
static void log_restart(struct gsn_t *gsn) {
FILE *f;
int i;
int counter = 0;
char filename[NAMESIZE];
filename[NAMESIZE-1] = 0; /* No null term. guarantee by strncpy */
strncpy(filename, gsn->statedir, NAMESIZE-1);
strncat(filename, RESTART_FILE,
NAMESIZE-1-sizeof(RESTART_FILE));
i = umask(022);
/* We try to open file. On failure we will later try to create file */
if (!(f = fopen(filename, "r"))) {
gtp_err(LOG_ERR, __FILE__, __LINE__, "fopen(path=%s, mode=%s) failed: Error = %s", filename, "r", strerror(errno));
}
else {
umask(i);
fscanf(f, "%d", &counter);
if (fclose(f)) {
gtp_err(LOG_ERR, __FILE__, __LINE__, "fclose failed: Error = %s", strerror(errno));
}
}
gsn->restart_counter = (unsigned char) counter;
gsn->restart_counter++;
if (!(f = fopen(filename, "w"))) {
gtp_err(LOG_ERR, __FILE__, __LINE__, "fopen(path=%s, mode=%s) failed: Error = %s", filename, "w", strerror(errno));
return;
}
umask(i);
fprintf(f, "%d\n", gsn->restart_counter);
if (fclose(f)) {
gtp_err(LOG_ERR, __FILE__, __LINE__, "fclose failed: Error = %s", strerror(errno));
return;
}
}
int gtp_new(struct gsn_t **gsn, char *statedir, struct in_addr *listen)
{
struct sockaddr_in addr;
int gtp_fd;
syslog(LOG_ERR, "GTP: gtp_newgsn() started");
*gsn = calloc(sizeof(struct gsn_t), 1); /* TODO */
(*gsn)->statedir = statedir;
log_restart(*gsn);
/* Initialise request retransmit queue */
queue_new(&(*gsn)->queue_req);
queue_new(&(*gsn)->queue_resp);
/* Initialise pdp table */
pdp_init();
/* Initialise call back functions */
(*gsn)->cb_create_context = 0;
(*gsn)->cb_delete_context = 0;
(*gsn)->cb_conf = 0;
(*gsn)->cb_gpdu = 0;
if ((gtp_fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0 ) {
(*gsn)->err_socket++;
gtp_err(LOG_ERR, __FILE__, __LINE__, "socket(domain=%d, type=%d, protocol=%d) failed: Error = %s", AF_INET, SOCK_DGRAM, 0, strerror(errno));
return -1;
}
(*gsn)->fd = gtp_fd;
/* syslog(LOG_ERR, "GTP: gtp_init() after socket");*/
(*gsn)->gsnc = *listen;
(*gsn)->gsnu = *listen;
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
/* addr.sin_addr = *inetaddr; */
addr.sin_addr = *listen; /* Same IP for user traffic and signalling*/
addr.sin_port = htons(GTP0_PORT);
if (bind(gtp_fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
(*gsn)->err_socket++;
gtp_err(LOG_ERR, __FILE__, __LINE__, "bind(fd=%d, addr=%lx, len=%d) failed: Error = %s", gtp_fd, (unsigned long) &addr, sizeof(addr), strerror(errno));
return -1;
}
/* Initialise "standard" GTP0 header */
memset(&gtp0_default, 0, sizeof(gtp0_default));
gtp0_default.flags=0x1e;
gtp0_default.spare1=0xff;
gtp0_default.spare2=0xff;
gtp0_default.spare3=0xff;
gtp0_default.number=0xff;
/* Initialise "standard" GTP1 header */
memset(&gtp1_default, 0, sizeof(gtp1_default));
gtp0_default.flags=0x1e;
return 0;
}
int gtp_free(struct gsn_t *gsn) {
/* Clean up retransmit queues */
queue_free(gsn->queue_req);
queue_free(gsn->queue_resp);
free(gsn);
return 0;
}
/* ***********************************************************
* Path management messages
* Messages: echo and version not supported.
* A path is connection between two UDP/IP endpoints
*
* A path is either using GTP0 or GTP1. A path can be
* established by any kind of GTP message??
* Which source port to use?
* GTP-C request destination port is 2123/3386
* GTP-U request destination port is 2152/3386
* T-PDU destination port is 2152/3386.
* For the above messages the source port is locally allocated.
* For response messages src=rx-dst and dst=rx-src.
* For simplicity we should probably use 2123+2152/3386 as
* src port even for the cases where src can be locally
* allocated. This also means that we have to listen only to
* the same ports.
* For response messages we need to be able to respond to
* the relevant src port even if it is locally allocated by
* the peer.
*
* The need for path management!
* We might need to keep a list of active paths. This might
* be in the form of remote IP address + UDP port numbers.
* (We will consider a path astablished if we have a context
* with the node in question)
*************************************************************/
/* Send off an echo request */
int gtp_echo_req(struct gsn_t *gsn, struct in_addr *inetaddr)
{
union gtp_packet packet;
get_default_gtp(0, &packet);
packet.gtp0.h.type = hton8(GTP_ECHO_REQ);
packet.gtp0.h.length = hton16(0);
return gtp_req(gsn, 0, &packet, GTP0_HEADER_SIZE, inetaddr, NULL);
}
/* Send of an echo reply */
int gtp_echo_resp(struct gsn_t *gsn, struct sockaddr_in *peer,
void *pack, unsigned len)
{
union gtp_packet packet;
int length = 0;
get_default_gtp(0, &packet);
gtpie_tv1(packet.gtp0.p, &length, GTP_MAX, GTPIE_RECOVERY,
gsn->restart_counter);
packet.gtp0.h.type = hton8(GTP_ECHO_RSP);
packet.gtp0.h.length = hton16(length);
packet.gtp0.h.seq = ((union gtp_packet*)pack)->gtp0.h.seq;
return gtp_resp(0, gsn, &packet, GTP0_HEADER_SIZE+length, peer);
}
/* Handle a received echo request */
int gtp_echo_ind(struct gsn_t *gsn, struct sockaddr_in *peer,
void *pack, unsigned len) {
uint16_t seq = ntoh16(((union gtp_packet*)pack)->gtp0.h.seq);
if(!gtp_dublicate(gsn, 0, peer, seq)) {
return 0; /* We allready send of response once */
}
/* Now send off a reply to the peer */
return gtp_echo_resp(gsn, peer, pack, len);
}
/* Handle a received echo reply */
int gtp_echo_conf(struct gsn_t *gsn, struct sockaddr_in *peer,
void *pack, unsigned len) {
union gtpie_member *ie[GTPIE_SIZE];
unsigned char recovery;
void *aid = NULL;
uint8_t type = 0;
/* Remove packet from queue */
if (gtp_conf(gsn, 0, peer, pack, len, &type, &aid)) return EOF;
if (gtpie_decaps(ie, pack+sizeof(struct gtp0_header), len-sizeof(struct gtp0_header))) {
gsn->invalid++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Invalid message format");
return EOF;
}
if (gtpie_gettv1(ie, GTPIE_RECOVERY, 0, &recovery)) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing mandatory field");
return EOF;
}
if (gsn->cb_conf) gsn->cb_conf(type, 0, NULL, aid); /* TODO: Should return recovery in callback */
return 0;
}
/* Send off a Version Not Supported message */
/* This message is somewhat special in that it actually is a
* response to some other message with unsupported GTP version
* For this reason it has parameters like a response, and does
* its own message transmission. No signalling queue is used
* The reply is sent to the peer IP and peer UDP. This means that
* the peer will be receiving a GTP0 message on a GTP1 port!
* In practice however this will never happen as a GTP0 GSN will
* only listen to the GTP0 port, and therefore will never receive
* anything else than GTP0 */
int gtp_unsup_resp(struct gsn_t *gsn, struct sockaddr_in *peer,
void *pack, unsigned len)
{
union gtp_packet packet;
int length = 0;
get_default_gtp(0, &packet);
packet.gtp0.h.type = hton8(GTP_NOT_SUPPORTED);
packet.gtp0.h.length = hton16(0);
return gtp_resp(0, gsn, &packet, GTP0_HEADER_SIZE+length, peer);
}
/* Handle a Version Not Supported message */
int gtp_unsup_conf(struct gsn_t *gsn, struct sockaddr_in *peer, void *pack, unsigned len) {
/* TODO: Need to check the validity of header and information elements */
/* TODO: Implement callback to application */
/* As long as we only support GTP0 we should never receive this message */
/* Should be implemented as part of GTP1 support */
/* print received message */
/*
printf("gtp_unsup_ind: from %s:UDP%u\n",
inet_ntoa(peer->sin_addr),
ntohs(peer->sin_port));
print_packet(pack, len);
*/
return 0;
}
/* ***********************************************************
* Session management messages
* Messages: create, update and delete PDP context
*
* Information storage
* Information storage for each PDP context is defined in
* 23.060 section 13.3. Includes IMSI, MSISDN, APN, PDP-type,
* PDP-address (IP address), sequence numbers, charging ID.
* For the SGSN it also includes radio related mobility
* information.
*************************************************************/
/* Send Create PDP Context Request */
extern int gtp_create_pdp_req(struct gsn_t *gsn, int version, void *aid,
struct in_addr* inetaddr, struct pdp_t *pdp) {
union gtp_packet packet;
int length = 0;
get_default_gtp(0, &packet);
if (0==0) { /* Always GTP0 */
gtpie_tv0(packet.gtp0.p, &length, GTP_MAX, GTPIE_QOS_PROFILE0,
sizeof(pdp->qos_req0), pdp->qos_req0);
gtpie_tv1(packet.gtp0.p, &length, GTP_MAX, GTPIE_RECOVERY,
gsn->restart_counter);
gtpie_tv1(packet.gtp0.p, &length, GTP_MAX, GTPIE_SELECTION_MODE,
pdp->selmode);
gtpie_tv2(packet.gtp0.p, &length, GTP_MAX, GTPIE_FL_DI,
pdp->fllu);
gtpie_tv2(packet.gtp0.p, &length, GTP_MAX, GTPIE_FL_C,
pdp->fllc);
gtpie_tlv(packet.gtp0.p, &length, GTP_MAX, GTPIE_EUA,
pdp->eua.l, pdp->eua.v);
gtpie_tlv(packet.gtp0.p, &length, GTP_MAX, GTPIE_APN,
pdp->apn_use.l, pdp->apn_use.v);
if (pdp->pco_req.l) { /* Optional PCO */
gtpie_tlv(packet.gtp0.p, &length, GTP_MAX, GTPIE_PCO,
pdp->pco_req.l, pdp->pco_req.v);
}
gtpie_tlv(packet.gtp0.p, &length, GTP_MAX, GTPIE_GSN_ADDR,
pdp->gsnlc.l, pdp->gsnlc.v);
gtpie_tlv(packet.gtp0.p, &length, GTP_MAX, GTPIE_GSN_ADDR,
pdp->gsnlu.l, pdp->gsnlu.v);
gtpie_tlv(packet.gtp0.p, &length, GTP_MAX, GTPIE_MSISDN,
pdp->msisdn.l, pdp->msisdn.v);
} else { /* GTP1 */
gtpie_tv0(packet.gtp1s.p, &length, GTP_MAX, GTPIE_IMSI,
sizeof(pdp->imsi), (uint8_t*) &pdp->imsi);
gtpie_tv1(packet.gtp1s.p, &length, GTP_MAX, GTPIE_RECOVERY,
gsn->restart_counter);
gtpie_tv1(packet.gtp1s.p, &length, GTP_MAX, GTPIE_SELECTION_MODE,
pdp->selmode);
gtpie_tv4(packet.gtp1s.p, &length, GTP_MAX, GTPIE_TEI_DI,
pdp->teid_own);
gtpie_tv4(packet.gtp1s.p, &length, GTP_MAX, GTPIE_TEI_C,
pdp->teic_own);
gtpie_tv1(packet.gtp1s.p, &length, GTP_MAX, GTPIE_NSAPI,
pdp->nsapi);
/*gtpie_tv1(packet.gtp1s.p, &length, GTP_MAX, GTPIE_NSAPI,
pdp->nsapil); For use by several QoS profiles for the same address */
gtpie_tv2(packet.gtp1s.p, &length, GTP_MAX, GTPIE_CHARGING_C,
pdp->cch_pdp);
gtpie_tv2(packet.gtp1s.p, &length, GTP_MAX, GTPIE_TRACE_REF,
pdp->traceref);
gtpie_tv2(packet.gtp1s.p, &length, GTP_MAX, GTPIE_TRACE_TYPE,
pdp->tracetype);
gtpie_tlv(packet.gtp1s.p, &length, GTP_MAX, GTPIE_EUA,
pdp->eua.l, pdp->eua.v);
gtpie_tlv(packet.gtp1s.p, &length, GTP_MAX, GTPIE_APN,
pdp->apn_use.l, pdp->apn_use.v);
gtpie_tlv(packet.gtp1s.p, &length, GTP_MAX, GTPIE_PCO,
pdp->pco_req.l, pdp->pco_req.v);
gtpie_tlv(packet.gtp1s.p, &length, GTP_MAX, GTPIE_GSN_ADDR,
pdp->gsnlc.l, pdp->gsnlc.v);
gtpie_tlv(packet.gtp1s.p, &length, GTP_MAX, GTPIE_GSN_ADDR,
pdp->gsnlu.l, pdp->gsnlu.v);
gtpie_tlv(packet.gtp1s.p, &length, GTP_MAX, GTPIE_MSISDN,
pdp->msisdn.l, pdp->msisdn.v);
gtpie_tlv(packet.gtp1s.p, &length, GTP_MAX, GTPIE_QOS_PROFILE,
pdp->qos_req.l, pdp->qos_req.v);
gtpie_tlv(packet.gtp1s.p, &length, GTP_MAX, GTPIE_TFT,
pdp->tft.l, pdp->tft.v);
gtpie_tlv(packet.gtp1s.p, &length, GTP_MAX, GTPIE_TRIGGER_ID,
pdp->triggerid.l, pdp->triggerid.v);
gtpie_tlv(packet.gtp1s.p, &length, GTP_MAX, GTPIE_OMC_ID,
pdp->omcid.l, pdp->omcid.v);
}
packet.gtp0.h.type = hton8(GTP_CREATE_PDP_REQ);
packet.gtp0.h.length = hton16(length);
packet.gtp0.h.flow = 0;
packet.gtp0.h.tid = pdp->tid;
gtp_req(gsn, 0, &packet, GTP0_HEADER_SIZE+length, inetaddr, aid);
return 0;
}
/* Send Create PDP Context Response */
int gtp_create_pdp_resp(struct gsn_t *gsn, int version,
struct sockaddr_in *peer,
void *pack, unsigned len,
struct pdp_t *pdp, uint8_t cause)
{
union gtp_packet packet;
int length = 0;
get_default_gtp(0, &packet);
gtpie_tv1(packet.gtp0.p, &length, GTP_MAX, GTPIE_CAUSE, cause);
if (cause == GTPCAUSE_ACC_REQ) {
gtpie_tv0(packet.gtp0.p, &length, GTP_MAX, GTPIE_QOS_PROFILE0,
sizeof(pdp->qos_neg0), pdp->qos_neg0);
gtpie_tv1(packet.gtp0.p, &length, GTP_MAX, GTPIE_REORDER,
pdp->reorder);
gtpie_tv1(packet.gtp0.p, &length, GTP_MAX, GTPIE_RECOVERY,
gsn->restart_counter);
gtpie_tv2(packet.gtp0.p, &length, GTP_MAX, GTPIE_FL_DI,
pdp->fllu);
gtpie_tv2(packet.gtp0.p, &length, GTP_MAX, GTPIE_FL_C,
pdp->fllc);
gtpie_tv4(packet.gtp0.p, &length, GTP_MAX, GTPIE_CHARGING_ID,
0x12345678);
gtpie_tlv(packet.gtp0.p, &length, GTP_MAX, GTPIE_EUA,
pdp->eua.l, pdp->eua.v);
if (pdp->pco_neg.l) { /* Optional PCO */
gtpie_tlv(packet.gtp0.p, &length, GTP_MAX, GTPIE_PCO,
pdp->pco_neg.l, pdp->pco_neg.v);
}
gtpie_tlv(packet.gtp0.p, &length, GTP_MAX, GTPIE_GSN_ADDR,
pdp->gsnlc.l, pdp->gsnlc.v);
gtpie_tlv(packet.gtp0.p, &length, GTP_MAX, GTPIE_GSN_ADDR,
pdp->gsnlu.l, pdp->gsnlu.v);
}
packet.gtp0.h.type = hton8(GTP_CREATE_PDP_RSP);
packet.gtp0.h.length = hton16(length);
packet.gtp0.h.flow = hton16(pdp->flrc);
packet.gtp0.h.seq = ((union gtp_packet*)pack)->gtp0.h.seq;
packet.gtp0.h.tid = ((union gtp_packet*)pack)->gtp0.h.tid;
return gtp_resp(0, gsn, &packet, GTP0_HEADER_SIZE+length, peer);
}
/* Handle Create PDP Context Request */
int gtp_create_pdp_ind(struct gsn_t *gsn, int version,
struct sockaddr_in *peer, void *pack, unsigned len) {
struct pdp_t *pdp, *pdp_old;
struct pdp_t pdp_buf;
union gtpie_member* ie[GTPIE_SIZE];
uint8_t recovery;
uint64_t imsi;
uint8_t nsapi;
int auth = 0; /* Allow access if no callback is defined */
uint16_t seq = ntoh16(((union gtp_packet*)pack)->gtp0.h.seq);
if(!gtp_dublicate(gsn, 0, peer, seq)) {
return 0; /* We allready send of response once */
}
/* Decode information elements */
if (gtpie_decaps(ie, pack+GTP0_HEADER_SIZE, len-GTP0_HEADER_SIZE)) {
gsn->invalid++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Invalid message format");
if (0 == version)
return EOF;
else
return gtp_create_pdp_resp(gsn, version, peer, pack, len, pdp,
GTPCAUSE_INVALID_MESSAGE);
}
pdp = &pdp_buf;
memset(pdp, 0, sizeof(struct pdp_t));
/* Extract IMSI and NSAPI from header */
imsi = ((union gtp_packet*)pack)->gtp0.h.tid & 0x0fffffffffffffff;
nsapi = (((union gtp_packet*)pack)->gtp0.h.tid & 0xf000000000000000) >> 60;
/* pdp_newpdp(&pdp, imsi, nsapi); TODO: Need to remove again */
if (gtpie_gettv0(ie, GTPIE_QOS_PROFILE0, 0,
pdp->qos_req0, sizeof(pdp->qos_req0))) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing mandatory information field");
return gtp_create_pdp_resp(gsn, version, peer, pack, len, pdp,
GTPCAUSE_MAN_IE_MISSING);
}
/* Extract recovery (optional) */
if (!gtpie_gettv1(ie, GTPIE_RECOVERY, 0, &recovery)) {
/* TODO: Handle received recovery IE */
}
if (gtpie_gettv0(ie, GTPIE_SELECTION_MODE, 0,
&pdp->selmode, sizeof(pdp->selmode))) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing mandatory information field");
return gtp_create_pdp_resp(gsn, version, peer, pack, len, pdp,
GTPCAUSE_MAN_IE_MISSING);
}
if (gtpie_gettv2(ie, GTPIE_FL_DI, 0, &pdp->flru)) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing mandatory information field");
return gtp_create_pdp_resp(gsn, version, peer, pack, len, pdp,
GTPCAUSE_MAN_IE_MISSING);
}
if (gtpie_gettv2(ie, GTPIE_FL_C, 0, &pdp->flrc)) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing mandatory information field");
return gtp_create_pdp_resp(gsn, version, peer, pack, len, pdp,
GTPCAUSE_MAN_IE_MISSING);
}
if (gtpie_gettlv(ie, GTPIE_EUA, 0, &pdp->eua.l,
&pdp->eua.v, sizeof(pdp->eua.v))) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing mandatory information field");
return gtp_create_pdp_resp(gsn, version, peer, pack, len, pdp,
GTPCAUSE_MAN_IE_MISSING);
}
if (gtpie_gettlv(ie, GTPIE_APN, 0, &pdp->apn_req.l,
&pdp->apn_req.v, sizeof(pdp->apn_req.v))) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing mandatory information field");
return gtp_create_pdp_resp(gsn, version, peer, pack, len, pdp,
GTPCAUSE_MAN_IE_MISSING);
}
/* Extract protocol configuration options (optional) */
if (!gtpie_gettlv(ie, GTPIE_PCO, 0, &pdp->pco_req.l,
&pdp->pco_req.v, sizeof(pdp->pco_req.v))) {
/* TODO: Handle PCO IE */
}
if (gtpie_gettlv(ie, GTPIE_GSN_ADDR, 0, &pdp->gsnrc.l,
&pdp->gsnrc.v, sizeof(pdp->gsnrc.v))) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing mandatory information field");
return gtp_create_pdp_resp(gsn, version, peer, pack, len, pdp,
GTPCAUSE_MAN_IE_MISSING);
}
if (gtpie_gettlv(ie, GTPIE_GSN_ADDR, 1, &pdp->gsnru.l,
&pdp->gsnru.v, sizeof(pdp->gsnru.v))) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing mandatory information field");
return gtp_create_pdp_resp(gsn, version, peer, pack, len, pdp,
GTPCAUSE_MAN_IE_MISSING);
}
if (gtpie_gettlv(ie, GTPIE_MSISDN, 0, &pdp->msisdn.l,
&pdp->msisdn.v, sizeof(pdp->msisdn.v))) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing mandatory information field");
return gtp_create_pdp_resp(gsn, version, peer, pack, len, pdp,
GTPCAUSE_MAN_IE_MISSING);
}
in_addr2gsna(&pdp->gsnlc, &gsn->gsnc);
in_addr2gsna(&pdp->gsnlu, &gsn->gsnu);
if (GTP_DEBUG) printf("gtp_create_pdp_ind: Before pdp_tidget\n");
if (!pdp_tidget(&pdp_old, ((union gtp_packet*)pack)->gtp0.h.tid)) {
/* Found old pdp with same tid. Now the voodoo begins! */
/* We check that the APN, selection mode and MSISDN is the same */
if (GTP_DEBUG) printf("gtp_create_pdp_ind: Old context found\n");
if ( (pdp->apn_req.l == pdp_old->apn_req.l)
&& (!memcmp(pdp->apn_req.v, pdp_old->apn_req.v, pdp->apn_req.l))
&& (pdp->selmode == pdp_old->selmode)
&& (pdp->msisdn.l == pdp_old->msisdn.l)
&& (!memcmp(pdp->msisdn.v, pdp_old->msisdn.v, pdp->msisdn.l))) {
/* OK! We are dealing with the same APN. We will copy new
* parameters to the old pdp and send off confirmation
* We ignore the following information elements:
* QoS: MS will get originally negotiated QoS.
* End user address (EUA). MS will get old EUA anyway.
* Protocol configuration option (PCO): Only application can verify */
if (GTP_DEBUG) printf("gtp_create_pdp_ind: Old context found\n");
/* Copy remote flow label */
pdp_old->flru = pdp->flru;
pdp_old->flrc = pdp->flrc;
/* Copy peer GSN address */
pdp_old->gsnrc.l = pdp->gsnrc.l;
memcpy(&pdp_old->gsnrc.v, &pdp->gsnrc.v, pdp->gsnrc.l);
pdp_old->gsnru.l = pdp->gsnru.l;
memcpy(&pdp_old->gsnru.v, &pdp->gsnru.v, pdp->gsnru.l);
/* pdp_freepdp(pdp); not nessasary anymore since never allocated */
pdp = pdp_old;
/* Confirm to peer that things were "successful" */
return gtp_create_pdp_resp(gsn, version, peer, pack, len, pdp,
GTPCAUSE_ACC_REQ);
}
else { /* This is not the same PDP context. Delete the old one. */
if (GTP_DEBUG) printf("gtp_create_pdp_ind: Deleting old context\n");
if (gsn->cb_delete_context) gsn->cb_delete_context(pdp_old);
pdp_freepdp(pdp_old);
if (GTP_DEBUG) printf("gtp_create_pdp_ind: Deleted...\n");
}
}
pdp_newpdp(&pdp, imsi, nsapi, pdp);
/* Callback function to validata login */
if (gsn->cb_create_context !=0)
auth = gsn->cb_create_context(pdp);
/* Now send off a reply to the peer */
if (!auth) {
return gtp_create_pdp_resp(gsn, version, peer, pack, len, pdp,
GTPCAUSE_ACC_REQ);
}
else {
gtp_create_pdp_resp(gsn, version, peer, pack, len, pdp,
GTPCAUSE_USER_AUTH_FAIL);
pdp_freepdp(pdp);
return 0;
}
}
/* Handle Create PDP Context Response */
int gtp_create_pdp_conf(struct gsn_t *gsn, int version,
struct sockaddr_in *peer,
void *pack, unsigned len) {
struct pdp_t *pdp;
union gtpie_member *ie[GTPIE_SIZE];
uint8_t cause, recovery;
void *aid = NULL;
uint8_t type = 0;
/* Remove packet from queue */
if (gtp_conf(gsn, 0, peer, pack, len, &type, &aid)) return EOF;
/* Find the context in question */
if (pdp_getgtp0(&pdp, ntoh16(((union gtp_packet*)pack)->gtp0.h.flow))) {
gsn->err_unknownpdp++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Unknown PDP context");
if (gsn->cb_conf) gsn->cb_conf(type, EOF, NULL, aid);
return EOF;
}
/* Decode information elements */
if (gtpie_decaps(ie, pack+GTP0_HEADER_SIZE, len-GTP0_HEADER_SIZE)) {
gsn->invalid++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Invalid message format");
if (gsn->cb_conf) gsn->cb_conf(type, EOF, pdp, aid);
return EOF;
}
/* Extract cause value (mandatory) */
if (gtpie_gettv1(ie, GTPIE_CAUSE, 0, &cause)) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing mandatory information field");
if (gsn->cb_conf) gsn->cb_conf(type, EOF, pdp, aid);
return EOF;
}
/* Extract recovery (optional) */
if (!gtpie_gettv1(ie, GTPIE_RECOVERY, 0, &recovery)) {
/* TODO: Handle received recovery IE */
}
/* Extract protocol configuration options (optional) */
if (!gtpie_gettlv(ie, GTPIE_PCO, 0, &pdp->pco_req.l,
&pdp->pco_req.v, sizeof(pdp->pco_req.v))) {
/* TODO: Handle PCO IE */
}
/* Check all conditional information elements */
if (GTPCAUSE_ACC_REQ == cause) {
if (gtpie_gettv0(ie, GTPIE_QOS_PROFILE0, 0, /* TODO: HACK only gtp0 */
&pdp->qos_neg0, sizeof(pdp->qos_neg0))) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing conditional information field");
if (gsn->cb_conf) gsn->cb_conf(type, EOF, pdp, aid);
return EOF;
}
/* pdp->qos_neg.l = 3; * TODO: HACK only gtp0 */
if (gtpie_gettv1(ie, GTPIE_REORDER, 0, &pdp->reorder)) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing conditional information field");
if (gsn->cb_conf) gsn->cb_conf(type, EOF, pdp, aid);
return EOF;
}
if (gtpie_gettv2(ie, GTPIE_FL_DI, 0, &pdp->flru)) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing conditional information field");
if (gsn->cb_conf) gsn->cb_conf(type, EOF, pdp, aid);
return EOF;
}
if (gtpie_gettv2(ie, GTPIE_FL_C, 0, &pdp->flrc)) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing conditional information field");
if (gsn->cb_conf) gsn->cb_conf(type, EOF, pdp, aid);
return EOF;
}
if (gtpie_gettv4(ie, GTPIE_CHARGING_ID, 0, &pdp->cid)) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing conditional information field");
if (gsn->cb_conf) gsn->cb_conf(type, EOF, pdp, aid);
return gtp_create_pdp_resp(gsn, version, peer, pack, len, pdp,
GTPCAUSE_MAN_IE_MISSING);
}
if (gtpie_gettlv(ie, GTPIE_EUA, 0, &pdp->eua.l,
&pdp->eua.v, sizeof(pdp->eua.v))) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing conditional information field");
if (gsn->cb_conf) gsn->cb_conf(type, EOF, pdp, aid);
return EOF;
}
if (gtpie_gettlv(ie, GTPIE_GSN_ADDR, 0, &pdp->gsnrc.l,
&pdp->gsnrc.v, sizeof(pdp->gsnrc.v))) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing conditional information field");
if (gsn->cb_conf) gsn->cb_conf(type, EOF, pdp, aid);
return EOF;
}
if (gtpie_gettlv(ie, GTPIE_GSN_ADDR, 1, &pdp->gsnru.l,
&pdp->gsnru.v, sizeof(pdp->gsnru.v))) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing conditional information field");
if (gsn->cb_conf) gsn->cb_conf(type, EOF, pdp, aid);
return EOF;
}
}
if (gsn->cb_conf) gsn->cb_conf(type, cause, pdp, aid);
return 0;
}
/* Send Update PDP Context Request */
extern int gtp_update_pdp_req(struct gsn_t *gsn, int version, void *aid,
struct in_addr* inetaddr, struct pdp_t *pdp) {
union gtp_packet packet;
int length = 0;
get_default_gtp(0, &packet);
gtpie_tv0(packet.gtp0.p, &length, GTP_MAX, GTPIE_QOS_PROFILE0,
sizeof(pdp->qos_req0), pdp->qos_req0);
gtpie_tv1(packet.gtp0.p, &length, GTP_MAX, GTPIE_RECOVERY,
gsn->restart_counter);
gtpie_tv2(packet.gtp0.p, &length, GTP_MAX, GTPIE_FL_DI,
pdp->fllu);
gtpie_tv2(packet.gtp0.p, &length, GTP_MAX, GTPIE_FL_C,
pdp->fllc);
gtpie_tlv(packet.gtp0.p, &length, GTP_MAX, GTPIE_GSN_ADDR,
pdp->gsnlc.l, pdp->gsnlc.v);
gtpie_tlv(packet.gtp0.p, &length, GTP_MAX, GTPIE_GSN_ADDR,
pdp->gsnlu.l, pdp->gsnlu.v);
packet.gtp0.h.type = hton8(GTP_UPDATE_PDP_REQ);
packet.gtp0.h.length = hton16(length);
packet.gtp0.h.flow = 0;
packet.gtp0.h.tid = (pdp->imsi & 0x0fffffffffffffff) + ((uint64_t)pdp->nsapi << 60);
return gtp_req(gsn, 0, &packet, GTP0_HEADER_SIZE+length, inetaddr, aid);
}
/* Send Update PDP Context Response */
int gtp_update_pdp_resp(struct gsn_t *gsn, int version,
struct sockaddr_in *peer,
void *pack, unsigned len,
struct pdp_t *pdp, uint8_t cause)
{
union gtp_packet packet;
int length = 0;
get_default_gtp(0, &packet);
gtpie_tv1(packet.gtp0.p, &length, GTP_MAX, GTPIE_CAUSE, cause);
if (cause == GTPCAUSE_ACC_REQ) {
gtpie_tv0(packet.gtp0.p, &length, GTP_MAX, GTPIE_QOS_PROFILE0,
sizeof(pdp->qos_sub0), pdp->qos_sub0);
gtpie_tv1(packet.gtp0.p, &length, GTP_MAX, GTPIE_RECOVERY,
gsn->restart_counter);
gtpie_tv2(packet.gtp0.p, &length, GTP_MAX, GTPIE_FL_DI,
pdp->fllu);
gtpie_tv2(packet.gtp0.p, &length, GTP_MAX, GTPIE_FL_C,
pdp->fllc);
gtpie_tv4(packet.gtp0.p, &length, GTP_MAX, GTPIE_CHARGING_ID,
0x12345678);
gtpie_tlv(packet.gtp0.p, &length, GTP_MAX, GTPIE_GSN_ADDR,
pdp->gsnlc.l, pdp->gsnlc.v);
gtpie_tlv(packet.gtp0.p, &length, GTP_MAX, GTPIE_GSN_ADDR,
pdp->gsnlu.l, pdp->gsnlu.v);
}
packet.gtp0.h.type = hton8(GTP_UPDATE_PDP_RSP);
packet.gtp0.h.length = hton16(length);
packet.gtp0.h.flow = hton16(pdp->flrc);
packet.gtp0.h.seq = ((union gtp_packet*)pack)->gtp0.h.seq;
packet.gtp0.h.tid = (pdp->imsi & 0x0fffffffffffffff) + ((uint64_t)pdp->nsapi << 60);
return gtp_resp(0, gsn, &packet, GTP0_HEADER_SIZE+length, peer);
}
/* Handle Update PDP Context Request */
int gtp_update_pdp_ind(struct gsn_t *gsn, int version,
struct sockaddr_in *peer, void *pack, unsigned len) {
struct pdp_t *pdp, *pdp2;
struct pdp_t pdp_buf;
union gtpie_member* ie[GTPIE_SIZE];
uint8_t recovery;
uint16_t seq = ntoh16(((union gtp_packet*)pack)->gtp0.h.seq);
/* Is this a dublicate ? */
if(!gtp_dublicate(gsn, 0, peer, seq)) {
return 0; /* We allready send of response once */
}
/* Find the pdp context in question */
if (pdp_getgtp0(&pdp, ntoh16(((union gtp_packet*)pack)->gtp0.h.flow))) {
gsn->err_unknownpdp++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Unknown PDP context");
return gtp_update_pdp_resp(gsn, version, peer, pack, len, NULL,
GTPCAUSE_NON_EXIST);
}
/* Decode information elements */
if (gtpie_decaps(ie, pack+GTP0_HEADER_SIZE, len-GTP0_HEADER_SIZE)) {
gsn->invalid++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Invalid message format");
if (0 == version)
return EOF;
else
return gtp_update_pdp_resp(gsn, version, peer, pack, len, pdp,
GTPCAUSE_INVALID_MESSAGE);
}
pdp2 = &pdp_buf;
memcpy(pdp2, pdp, sizeof (struct pdp_t)); /* Generate local copy */
if (gtpie_gettv0(ie, GTPIE_QOS_PROFILE0, 0, /* TODO: HACK only gtp0 */
&pdp2->qos_req0, sizeof(pdp2->qos_req0))) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing mandatory information field");
return gtp_update_pdp_resp(gsn, version, peer, pack, len, pdp2,
GTPCAUSE_MAN_IE_MISSING);
}
/* pdp2->qos_req.l = 3; * TODO: HACK only gtp0 */
/* Extract recovery (optional) */
if (!gtpie_gettv1(ie, GTPIE_RECOVERY, 0, &recovery)) {
/* TODO: Handle received recovery IE */
}
if (gtpie_gettv2(ie, GTPIE_FL_DI, 0, &pdp2->flru)) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing mandatory information field");
return gtp_update_pdp_resp(gsn, version, peer, pack, len, pdp2,
GTPCAUSE_MAN_IE_MISSING);
}
if (gtpie_gettv2(ie, GTPIE_FL_C, 0, &pdp2->flrc)) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing mandatory information field");
return gtp_update_pdp_resp(gsn, version, peer, pack, len, pdp2,
GTPCAUSE_MAN_IE_MISSING);
}
if (gtpie_gettlv(ie, GTPIE_GSN_ADDR, 0, &pdp2->gsnrc.l,
&pdp2->gsnrc.v, sizeof(pdp2->gsnrc.v))) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing mandatory information field");
return gtp_update_pdp_resp(gsn, version, peer, pack, len, pdp2,
GTPCAUSE_MAN_IE_MISSING);
}
if (gtpie_gettlv(ie, GTPIE_GSN_ADDR, 1, &pdp2->gsnru.l,
&pdp2->gsnru.v, sizeof(pdp2->gsnru.v))) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing mandatory information field");
return gtp_update_pdp_resp(gsn, version, peer, pack, len, pdp2,
GTPCAUSE_MAN_IE_MISSING);
}
/* OK! It seames as if we received a valid message */
memcpy(pdp, pdp2, sizeof (struct pdp_t)); /* Update original pdp */
/* Confirm to peer that things were "successful" */
return gtp_update_pdp_resp(gsn, version, peer, pack, len, pdp,
GTPCAUSE_ACC_REQ);
}
/* Handle Update PDP Context Response */
int gtp_update_pdp_conf(struct gsn_t *gsn, int version,
struct sockaddr_in *peer,
void *pack, unsigned len) {
struct pdp_t *pdp;
union gtpie_member *ie[GTPIE_SIZE];
uint8_t cause, recovery;
void *aid = NULL;
uint8_t type = 0;
/* Remove packet from queue */
if (gtp_conf(gsn, 0, peer, pack, len, &type, &aid)) return EOF;
/* Find the context in question */
if (pdp_getgtp0(&pdp, ntoh16(((union gtp_packet*)pack)->gtp0.h.flow))) {
gsn->err_unknownpdp++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Unknown PDP context");
if (gsn->cb_conf) gsn->cb_conf(type, cause, NULL, aid);
return EOF;
}
/* Decode information elements */
if (gtpie_decaps(ie, pack+GTP0_HEADER_SIZE, len-GTP0_HEADER_SIZE)) {
gsn->invalid++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Invalid message format");
if (gsn->cb_conf) gsn->cb_conf(type, EOF, pdp, aid);
if (gsn->cb_delete_context) gsn->cb_delete_context(pdp);
pdp_freepdp(pdp);
return EOF;
}
/* Extract cause value (mandatory) */
if (gtpie_gettv1(ie, GTPIE_CAUSE, 0, &cause)) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing mandatory information field");
if (gsn->cb_conf) gsn->cb_conf(type, EOF, pdp, aid);
if (gsn->cb_delete_context) gsn->cb_delete_context(pdp);
pdp_freepdp(pdp);
return EOF;
}
/* Extract recovery (optional) */
if (!gtpie_gettv1(ie, GTPIE_RECOVERY, 0, &recovery)) {
/* TODO: Handle received recovery IE */
}
/* Check all conditional information elements */
if (GTPCAUSE_ACC_REQ != cause) {
if (gsn->cb_conf) gsn->cb_conf(type, cause, pdp, aid);
if (gsn->cb_delete_context) gsn->cb_delete_context(pdp);
pdp_freepdp(pdp);
return 0;
}
else {
/* Check for missing conditionary information elements */
if (!(gtpie_exist(ie, GTPIE_QOS_PROFILE0, 0) &&
gtpie_exist(ie, GTPIE_REORDER, 0) &&
gtpie_exist(ie, GTPIE_FL_DI, 0) &&
gtpie_exist(ie, GTPIE_FL_C, 0) &&
gtpie_exist(ie, GTPIE_CHARGING_ID, 0) &&
gtpie_exist(ie, GTPIE_EUA, 0) &&
gtpie_exist(ie, GTPIE_GSN_ADDR, 0) &&
gtpie_exist(ie, GTPIE_GSN_ADDR, 1))) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing conditional information field");
if (gsn->cb_conf) gsn->cb_conf(type, EOF, pdp, aid);
if (gsn->cb_delete_context) gsn->cb_delete_context(pdp);
pdp_freepdp(pdp);
return EOF;
}
/* Update pdp with new values */
gtpie_gettv0(ie, GTPIE_QOS_PROFILE0, 0,
pdp->qos_neg0, sizeof(pdp->qos_neg0));
gtpie_gettv1(ie, GTPIE_REORDER, 0, &pdp->reorder);
gtpie_gettv2(ie, GTPIE_FL_DI, 0, &pdp->flru);
gtpie_gettv2(ie, GTPIE_FL_C, 0, &pdp->flrc);
gtpie_gettv4(ie, GTPIE_CHARGING_ID, 0, &pdp->cid);
gtpie_gettlv(ie, GTPIE_EUA, 0, &pdp->eua.l,
&pdp->eua.v, sizeof(pdp->eua.v));
gtpie_gettlv(ie, GTPIE_GSN_ADDR, 0, &pdp->gsnrc.l,
&pdp->gsnrc.v, sizeof(pdp->gsnrc.v));
gtpie_gettlv(ie, GTPIE_GSN_ADDR, 1, &pdp->gsnru.l,
&pdp->gsnru.v, sizeof(pdp->gsnru.v));
if (gsn->cb_conf) gsn->cb_conf(type, cause, pdp, aid);
return 0; /* Succes */
}
}
/* Send Delete PDP Context Request */
extern int gtp_delete_pdp_req(struct gsn_t *gsn, int version, void *aid,
struct pdp_t *pdp) {
union gtp_packet packet;
int length = 0;
struct in_addr addr;
if (gsna2in_addr(&addr, &pdp->gsnrc)) {
gsn->err_address++;
gtp_err(LOG_ERR, __FILE__, __LINE__, "GSN address conversion failed");
return EOF;
}
get_default_gtp(0, &packet);
packet.gtp0.h.type = hton8(GTP_DELETE_PDP_REQ);
packet.gtp0.h.length = hton16(length);
packet.gtp0.h.flow = hton16(pdp->flrc);
packet.gtp0.h.tid = (pdp->imsi & 0x0fffffffffffffff) + ((uint64_t)pdp->nsapi << 60);
return gtp_req(gsn, 0, &packet, GTP0_HEADER_SIZE+length, &addr, aid);
}
/* Send Delete PDP Context Response */
int gtp_delete_pdp_resp(struct gsn_t *gsn, int version,
struct sockaddr_in *peer,
void *pack, unsigned len,
struct pdp_t *pdp, uint8_t cause)
{
union gtp_packet packet;
int length = 0;
uint16_t flow = 0;
if (pdp) flow = hton16(pdp->flrc);
get_default_gtp(0, &packet);
gtpie_tv1(packet.gtp0.p, &length, GTP_MAX, GTPIE_CAUSE, cause);
packet.gtp0.h.type = hton8(GTP_DELETE_PDP_RSP);
packet.gtp0.h.length = hton16(length);
packet.gtp0.h.flow = flow;
packet.gtp0.h.seq = ((union gtp_packet*)pack)->gtp0.h.seq;
packet.gtp0.h.tid = ((union gtp_packet*)pack)->gtp0.h.tid;
if (pdp) {
/* Callback function to allow application to clean up */
if (gsn->cb_delete_context) gsn->cb_delete_context(pdp);
pdp_freepdp(pdp); /* Clean up PDP context */
}
return gtp_resp(0, gsn, &packet, GTP0_HEADER_SIZE+length, peer);
}
/* Handle Delete PDP Context Request */
int gtp_delete_pdp_ind(struct gsn_t *gsn, int version,
struct sockaddr_in *peer, void *pack, unsigned len) {
struct pdp_t *pdp;
union gtpie_member* ie[GTPIE_SIZE];
uint16_t seq = ntoh16(((union gtp_packet*)pack)->gtp0.h.seq);
/* Is this a dublicate ? */
if(!gtp_dublicate(gsn, 0, peer, seq)) {
return 0;
}
/* Find the pdp context in question */
if (pdp_getgtp0(&pdp, ntoh16(((union gtp_packet*)pack)->gtp0.h.flow))) {
gsn->err_unknownpdp++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Unknown PDP context");
if (0 == version)
return gtp_delete_pdp_resp(gsn, version, peer, pack, len, NULL,
GTPCAUSE_ACC_REQ);
else
return gtp_delete_pdp_resp(gsn, version, peer, pack, len, NULL,
GTPCAUSE_NON_EXIST);
}
/* Decode information elements */
if (gtpie_decaps(ie, pack+GTP0_HEADER_SIZE, len-GTP0_HEADER_SIZE)) {
gsn->invalid++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Invalid message format");
if (0 == version)
return EOF;
else
return gtp_delete_pdp_resp(gsn, version, peer, pack, len, pdp,
GTPCAUSE_INVALID_MESSAGE);
}
return gtp_delete_pdp_resp(gsn, version, peer, pack, len, pdp,
GTPCAUSE_ACC_REQ);
}
/* Handle Delete PDP Context Response */
int gtp_delete_pdp_conf(struct gsn_t *gsn, int version,
struct sockaddr_in *peer,
void *pack, unsigned len) {
struct pdp_t *pdp;
union gtpie_member *ie[GTPIE_SIZE];
uint8_t cause;
void *aid = NULL;
uint8_t type = 0;
/* Remove packet from queue */
if (gtp_conf(gsn, 0, peer, pack, len, &type, &aid)) return EOF;
/* Find the context in question */
if (pdp_getgtp0(&pdp, ntoh16(((union gtp_packet*)pack)->gtp0.h.flow))) {
gsn->err_unknownpdp++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Unknown PDP context");
return EOF;
}
/* Decode information elements */
if (gtpie_decaps(ie, pack+GTP0_HEADER_SIZE, len-GTP0_HEADER_SIZE)) {
gsn->invalid++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Invalid message format");
return EOF;
}
/* Extract cause value */
if (gtpie_gettv1(ie, GTPIE_CAUSE, 0, &cause)) {
gsn->missing++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Missing mandatory information field");
return EOF;
}
/* Check the cause value */
if ((GTPCAUSE_ACC_REQ != cause) && (GTPCAUSE_NON_EXIST != cause)) {
gsn->err_cause++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Unexpected cause value received: %d", cause);
return EOF;
}
/* Callback function to allow application to clean up */
if (gsn->cb_conf) gsn->cb_conf(type, cause, pdp, aid);
if (gsn->cb_delete_context) gsn->cb_delete_context(pdp);
pdp_freepdp(pdp);
return 0;
}
/* Send Error Indication (response to a GPDU message */
int gtp_error_ind_resp(struct gsn_t *gsn, int version,
struct sockaddr_in *peer,
void *pack, unsigned len)
{
union gtp_packet packet;
int length = 0;
get_default_gtp(0, &packet);
packet.gtp0.h.type = hton8(GTP_ERROR);
packet.gtp0.h.length = hton16(length);
packet.gtp0.h.flow = 0;
packet.gtp0.h.seq = ((union gtp_packet*)pack)->gtp0.h.seq;
packet.gtp0.h.tid = ((union gtp_packet*)pack)->gtp0.h.tid;
return gtp_resp(0, gsn, &packet, GTP0_HEADER_SIZE+length, peer);
}
/* Handle Error Indication */
int gtp_error_ind_conf(struct gsn_t *gsn, int version,
struct sockaddr_in *peer,
void *pack, unsigned len) {
struct pdp_t *pdp;
/* Find the context in question */
if (pdp_tidget(&pdp, ((union gtp_packet*)pack)->gtp0.h.tid)) {
gsn->err_unknownpdp++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Unknown PDP context");
return EOF;
}
gsn->err_unknownpdp++; /* TODO: Change counter */
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Received Error Indication");
if (gsn->cb_delete_context) gsn->cb_delete_context(pdp);
pdp_freepdp(pdp);
return 0;
}
int gtp_gpdu_ind(struct gsn_t *gsn, int version,
struct sockaddr_in *peer,
void *pack,
unsigned len) {
/* Need to include code to verify packet src and dest addresses */
struct pdp_t *pdp;
if (pdp_getgtp0(&pdp, ntoh16(((union gtp_packet*)pack)->gtp0.h.flow))) {
gsn->err_unknownpdp++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, peer, pack, len,
"Unknown PDP context");
return gtp_error_ind_resp(gsn, version, peer, pack, len);
}
/* Callback function */
if (gsn->cb_gpdu !=0)
return gsn->cb_gpdu(pdp, pack+20, len-20); /* TODO ???? */
return 0;
}
/* Receives GTP packet and sends off for further processing
* Function will check the validity of the header. If the header
* is not valid the packet is either dropped or a version not
* supported is returned to the peer.
* TODO: Need to decide on return values! */
int gtp_decaps(struct gsn_t *gsn)
{
unsigned char buffer[PACKET_MAX + 64 /*TODO: ip header */ ];
int status, ip_len = 0;
struct sockaddr_in peer;
int peerlen;
struct gtp0_header *pheader;
int version = 0; /* GTP version should be determined from header!*/
peerlen = sizeof(peer);
if ((status =
recvfrom(gsn->fd, buffer, sizeof(buffer), 0,
(struct sockaddr *) &peer, &peerlen)) < 0 ) {
gsn->err_readfrom++;
gtp_err(LOG_ERR, __FILE__, __LINE__, "recvfrom(fd=%d, buffer=%lx, len=%d) failed: status = %d error = %s", gsn->fd, (unsigned long) buffer, sizeof(buffer), status, status ? strerror(errno) : "No error");
return -1;
}
/* Strip off IP header, if present: TODO Is this nessesary? */
if ((buffer[0] & 0xF0) == 0x40) {
ip_len = (buffer[0] & 0xF) * 4;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, &peer, buffer, status,
"IP header found in return from read");
return -1;
}
/* Need at least 1 byte in order to check version */
if (status < (1)) {
gsn->empty++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, &peer, buffer, status,
"Discarding packet - too small");
return -1;
}
/* TODO: Remove these ERROR MESSAGES
gtp_err(LOG_ERR, __FILE__, __LINE__, "Discarding packet - too small");
gtp_errpack(LOG_ERR, __FILE__, __LINE__, &peer, buffer, status,
"Discarding packet - too small"); */
pheader = (struct gtp0_header *) (buffer + ip_len);
/* Version should be gtp0 (or earlier in theory) */
if (((pheader->flags & 0xe0) > 0x00)) {
gsn->unsup++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, &peer, buffer, status,
"Unsupported GTP version");
return gtp_unsup_resp(gsn, &peer, buffer, status); /* 29.60: 11.1.1 */
}
/* Check length of gtp0 packet */
if (((pheader->flags & 0xe0) == 0x00) && (status < GTP0_HEADER_SIZE)) {
gsn->tooshort++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, &peer, buffer, status,
"GTP0 packet too short");
return -1; /* Silently discard 29.60: 11.1.2 */
}
switch (pheader->type) {
case GTP_ECHO_REQ:
return gtp_echo_ind(gsn, &peer, buffer+ip_len, status - ip_len);
case GTP_ECHO_RSP:
return gtp_echo_conf(gsn, &peer, buffer+ip_len, status - ip_len);
case GTP_NOT_SUPPORTED:
return gtp_unsup_conf(gsn, &peer, buffer+ip_len, status - ip_len);
case GTP_CREATE_PDP_REQ:
return gtp_create_pdp_ind(gsn, version, &peer, buffer+ip_len,
status - ip_len);
case GTP_CREATE_PDP_RSP:
return gtp_create_pdp_conf(gsn, version, &peer, buffer+ip_len,
status - ip_len);
case GTP_UPDATE_PDP_REQ:
return gtp_update_pdp_ind(gsn, version, &peer, buffer+ip_len,
status - ip_len);
case GTP_UPDATE_PDP_RSP:
return gtp_update_pdp_conf(gsn, version, &peer, buffer+ip_len,
status - ip_len);
case GTP_DELETE_PDP_REQ:
return gtp_delete_pdp_ind(gsn, version, &peer, buffer+ip_len,
status - ip_len);
case GTP_DELETE_PDP_RSP:
return gtp_delete_pdp_conf(gsn, version, &peer, buffer+ip_len,
status - ip_len);
case GTP_ERROR:
return gtp_error_ind_conf(gsn, version, &peer, buffer+ip_len,
status - ip_len);
case GTP_GPDU:
return gtp_gpdu_ind(gsn, version, &peer, buffer+ip_len, status - ip_len);
default:
{
gsn->unknown++;
gtp_errpack(LOG_ERR, __FILE__, __LINE__, &peer, buffer, status,
"Unknown GTP message type received");
return -1;
}
}
}
int gtp_gpdu(struct gsn_t *gsn, struct pdp_t* pdp,
void *pack, unsigned len)
{
union gtp_packet packet;
struct sockaddr_in addr;
/*printf("gtp_encaps start\n");
print_packet(pack, len);*/
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
memcpy(&addr.sin_addr, pdp->gsnru.v,pdp->gsnru.l); /* TODO range check */
addr.sin_port = htons(GTP0_PORT);
get_default_gtp(0, &packet);
packet.gtp0.h.type = hton8(GTP_GPDU);
packet.gtp0.h.length = hton16(len);
packet.gtp0.h.seq = hton16(pdp->gtpsntx++);
packet.gtp0.h.flow = hton16(pdp->flru);
packet.gtp0.h.tid = (pdp->imsi & 0x0fffffffffffffff) + ((uint64_t)pdp->nsapi << 60);
if (len > sizeof (union gtp_packet) - sizeof(struct gtp0_header)) {
gsn->err_memcpy++;
gtp_err(LOG_ERR, __FILE__, __LINE__,
"Memcpy failed");
return EOF;
}
memcpy(packet.gtp0.p, pack, len); /* TODO Should be avoided! */
if (sendto(gsn->fd, &packet, GTP0_HEADER_SIZE+len, 0,
(struct sockaddr *) &addr, sizeof(addr)) < 0) {
gsn->err_sendto++;
gtp_err(LOG_ERR, __FILE__, __LINE__, "Sendto(fd=%d, msg=%lx, len=%d) failed: Error = %s", gsn->fd, (unsigned long) &packet, GTP0_HEADER_SIZE+len, strerror(errno));
return EOF;
}
return 0;
}
/* ***********************************************************
* Conversion functions
*************************************************************/
int char2ul_t(char* src, struct ul_t dst) {
dst.l = strlen(src)+1;
dst.v = malloc(dst.l);
dst.v[0] = dst.l - 1;
memcpy(&dst.v[1], src, dst.v[0]);
return 0;
}
/* ***********************************************************
* IP address conversion functions
* There exist several types of address representations:
* - eua: End User Address. (29.060, 7.7.27, message type 128)
* Used for signalling address to mobile station. Supports IPv4
* IPv6 x.25 etc. etc.
* - gsna: GSN Address. (29.060, 7.7.32, message type 133): IP address
* of GSN. If length is 4 it is IPv4. If length is 16 it is IPv6.
* - in_addr: IPv4 address struct.
* - sockaddr_in: Socket API representation of IP address and
* port number.
*************************************************************/
int ipv42eua(struct ul66_t *eua, struct in_addr *src) {
eua->v[0] = 0xf1; /* IETF */
eua->v[1] = 0x21; /* IPv4 */
if (src) {
eua->l = 6;
memcpy(&eua->v[2], src, 4);
}
else
{
eua->l = 2;
}
return 0;
}
int eua2ipv4(struct in_addr *dst, struct ul66_t *eua) {
if ((eua->l != 6) ||
(eua->v[0] != 0xf1) ||
(eua->v[1] = 0x21))
return -1; /* Not IPv4 address*/
memcpy(dst, &eua->v[2], 4);
return 0;
}
int gsna2in_addr(struct in_addr *dst, struct ul16_t *gsna) {
memset(dst, 0, sizeof(struct in_addr));
if (gsna->l != 4) return EOF; /* Return if not IPv4 */
memcpy(dst, gsna->v, gsna->l);
return 0;
}
int in_addr2gsna(struct ul16_t *gsna, struct in_addr *src) {
memset(gsna, 0, sizeof(struct ul16_t));
gsna->l = 4;
memcpy(gsna->v, src, gsna->l);
return 0;
}
View Git Blame Copy Permalink