mirror of
https://gitea.osmocom.org/cellular-infrastructure/osmo-ggsn.git
synced 2025-11-03 21:53:25 +00:00
0406bdde75
This way, the IP address / route handling between TUN devices and kernel GTP can be shared, which will provide not only a unified codebase but also a more consistent behavior. This also paves the road for to use kernel GTP from sgsnemu in the future. Related: OS#3214 Change-Id: Ic53a971136edd0d8871fbd6746d7b0090ce3a188
161 lines
3.5 KiB
C
161 lines
3.5 KiB
C
#ifdef __linux__
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#define _GNU_SOURCE 1 /* strdup() prototype, broken arpa/inet.h */
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#endif
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#include "../config.h"
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#ifdef HAVE_STDINT_H
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#include <stdint.h>
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <inttypes.h>
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#include <sys/types.h>
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#include <arpa/inet.h>
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#include <net/if.h>
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#include <libgtpnl/gtp.h>
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#include <libgtpnl/gtpnl.h>
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#include <libmnl/libmnl.h>
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#include <errno.h>
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#include <time.h>
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#include "../lib/tun.h"
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#include "../lib/syserr.h"
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#include "../gtp/pdp.h"
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#include "../gtp/gtp.h"
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#include <libgtpnl/gtp.h>
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#include <libgtpnl/gtpnl.h>
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#include <libmnl/libmnl.h>
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#include "gtp-kernel.h"
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static void pdp_debug(const char *prefix, const char *devname, struct pdp_t *pdp)
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{
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struct in46_addr ia46;
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struct in_addr ia;
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in46a_from_eua(&pdp->eua, &ia46);
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gsna2in_addr(&ia, &pdp->gsnrc);
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LOGPDPX(DGGSN, LOGL_DEBUG, pdp, "%s %s v%u TEID %"PRIx64" EUA=%s SGSN=%s\n", prefix,
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devname, pdp->version,
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pdp->version == 0 ? pdp_gettid(pdp->imsi, pdp->nsapi) : pdp->teid_gn,
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in46a_ntoa(&ia46), inet_ntoa(ia));
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}
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static struct {
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int genl_id;
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struct mnl_socket *nl;
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} gtp_nl;
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static int gtp_kernel_init_once(void)
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{
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/* only initialize once */
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if (gtp_nl.nl)
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return 0;
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gtp_nl.nl = genl_socket_open();
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if (gtp_nl.nl == NULL) {
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LOGP(DGGSN, LOGL_ERROR, "cannot create genetlink socket\n");
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return -1;
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}
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gtp_nl.genl_id = genl_lookup_family(gtp_nl.nl, "gtp");
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if (gtp_nl.genl_id < 0) {
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LOGP(DGGSN, LOGL_ERROR, "cannot lookup GTP genetlink ID\n");
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genl_socket_close(gtp_nl.nl);
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gtp_nl.nl = NULL;
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return -1;
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}
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LOGP(DGGSN, LOGL_NOTICE, "Initialized GTP kernel mode (genl ID is %d)\n", gtp_nl.genl_id);
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return 0;
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}
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int gtp_kernel_create(int dest_ns, const char *devname, int fd0, int fd1u)
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{
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if (gtp_kernel_init_once() < 0)
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return -1;
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return gtp_dev_create(dest_ns, devname, fd0, fd1u);
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}
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int gtp_kernel_create_sgsn(int dest_ns, const char *devname, int fd0, int fd1u)
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{
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if (gtp_kernel_init_once() < 0)
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return -1;
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return gtp_dev_create_sgsn(dest_ns, devname, fd0, fd1u);
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}
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void gtp_kernel_stop(const char *devname)
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{
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gtp_dev_destroy(devname);
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}
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int gtp_kernel_tunnel_add(struct pdp_t *pdp, const char *devname)
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{
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struct in_addr ms, sgsn;
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struct gtp_tunnel *t;
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int ret;
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pdp_debug(__func__, devname, pdp);
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t = gtp_tunnel_alloc();
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if (t == NULL)
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return -1;
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memcpy(&ms, &pdp->eua.v[2], sizeof(struct in_addr));
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memcpy(&sgsn, &pdp->gsnrc.v[0], sizeof(struct in_addr));
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gtp_tunnel_set_ifidx(t, if_nametoindex(devname));
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gtp_tunnel_set_version(t, pdp->version);
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gtp_tunnel_set_ms_ip4(t, &ms);
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gtp_tunnel_set_sgsn_ip4(t, &sgsn);
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if (pdp->version == 0) {
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gtp_tunnel_set_tid(t, pdp_gettid(pdp->imsi, pdp->nsapi));
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gtp_tunnel_set_flowid(t, pdp->flru);
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} else {
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gtp_tunnel_set_i_tei(t, pdp->teid_own);
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/* use the TEI advertised by SGSN when sending packets
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* towards the SGSN */
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gtp_tunnel_set_o_tei(t, pdp->teid_gn);
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}
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ret = gtp_add_tunnel(gtp_nl.genl_id, gtp_nl.nl, t);
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gtp_tunnel_free(t);
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return ret;
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}
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int gtp_kernel_tunnel_del(struct pdp_t *pdp, const char *devname)
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{
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struct gtp_tunnel *t;
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int ret;
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pdp_debug(__func__, devname, pdp);
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t = gtp_tunnel_alloc();
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if (t == NULL)
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return -1;
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gtp_tunnel_set_ifidx(t, if_nametoindex(devname));
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gtp_tunnel_set_version(t, pdp->version);
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if (pdp->version == 0) {
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gtp_tunnel_set_tid(t, pdp_gettid(pdp->imsi, pdp->nsapi));
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gtp_tunnel_set_flowid(t, pdp->flru);
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} else {
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gtp_tunnel_set_i_tei(t, pdp->teid_own);
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}
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ret = gtp_del_tunnel(gtp_nl.genl_id, gtp_nl.nl, t);
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gtp_tunnel_free(t);
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return ret;
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}
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