First steps towards a new GTP hub. The aim is to mux GTP connections, so that
multiple SGSN <--> GGSN links can pass through a single point. Background:
allow having more than one SGSN, possibly in various remote locations.
The recent addition of OAP to GSUP is related to the same background idea.
(This is a collapsed patch of various changes that do not make sense to review
in chronological order anymore, since a lot of it has thorougly transmorphed
after it was first committed.)
Sponsored-by: On-Waves ehf
---
openbsc/.gitignore | 2 +
openbsc/configure.ac | 1 +
openbsc/include/openbsc/Makefile.am | 1 +
openbsc/include/openbsc/debug.h | 1 +
openbsc/include/openbsc/gtphub.h | 345 +++++
openbsc/include/openbsc/vty.h | 1 +
openbsc/src/gprs/Makefile.am | 6 +
openbsc/src/gprs/gtphub.c | 1794 +++++++++++++++++++++++
openbsc/src/gprs/gtphub_main.c | 283 ++++
openbsc/src/gprs/gtphub_sep.c | 26 +
openbsc/src/gprs/gtphub_vty.c | 258 ++++
openbsc/tests/Makefile.am | 2 +-
openbsc/tests/gtphub/Makefile.am | 20 +
openbsc/tests/gtphub/gtphub_nc_test.gtphub.conf | 5 +
openbsc/tests/gtphub/gtphub_nc_test.ok | 7 +
openbsc/tests/gtphub/gtphub_nc_test.sh | 85 ++
openbsc/tests/gtphub/gtphub_test.c | 675 +++++++++
openbsc/tests/gtphub/gtphub_test.ok | 3 +
openbsc/tests/gtphub/hex2bin.py | 13 +
openbsc/tests/testsuite.at | 12 +
20 files changed, 3539 insertions(+), 1 deletion(-)
create mode 100644 openbsc/include/openbsc/gtphub.h
create mode 100644 openbsc/src/gprs/gtphub.c
create mode 100644 openbsc/src/gprs/gtphub_main.c
create mode 100644 openbsc/src/gprs/gtphub_sep.c
create mode 100644 openbsc/src/gprs/gtphub_vty.c
create mode 100644 openbsc/tests/gtphub/Makefile.am
create mode 100644 openbsc/tests/gtphub/gtphub_nc_test.gtphub.conf
create mode 100644 openbsc/tests/gtphub/gtphub_nc_test.ok
create mode 100755 openbsc/tests/gtphub/gtphub_nc_test.sh
create mode 100644 openbsc/tests/gtphub/gtphub_test.c
create mode 100644 openbsc/tests/gtphub/gtphub_test.ok
create mode 100755 openbsc/tests/gtphub/hex2bin.py
diff --git a/openbsc/.gitignore b/openbsc/.gitignore
index ca73db6..fc3d0bf 100644
--- a/openbsc/.gitignore
+++ b/openbsc/.gitignore
@@ -53,6 +53,7 @@ src/utils/isdnsync
src/nat/bsc_nat
src/gprs/osmo-sgsn
src/gprs/osmo-gbproxy
+src/gprs/osmo-gtphub
src/osmo-bsc_nat/osmo-bsc_nat
#tests
@@ -78,6 +79,7 @@ tests/mgcp/mgcp_transcoding_test
tests/sgsn/sgsn_test
tests/subscr/subscr_test
tests/oap/oap_test
+tests/gtphub/gtphub_test
tests/atconfig
tests/atlocal
diff --git a/openbsc/configure.ac b/openbsc/configure.ac
index 8b7ce62..098e5b4 100644
--- a/openbsc/configure.ac
+++ b/openbsc/configure.ac
@@ -210,6 +210,7 @@ AC_OUTPUT(
tests/sgsn/Makefile
tests/subscr/Makefile
tests/oap/Makefile
+ tests/gtphub/Makefile
doc/Makefile
doc/examples/Makefile
Makefile)
diff --git a/openbsc/include/openbsc/Makefile.am
b/openbsc/include/openbsc/Makefile.am
index 8a074c2..15c38d1 100644
--- a/openbsc/include/openbsc/Makefile.am
+++ b/openbsc/include/openbsc/Makefile.am
@@ -18,6 +18,7 @@ noinst_HEADERS = abis_nm.h abis_rsl.h db.h gsm_04_08.h
gsm_data.h \
gprs_gb_parse.h smpp.h meas_feed.h gprs_gsup_messages.h \
gprs_gsup_client.h bsc_msg_filter.h \
oap.h oap_messages.h
+ gtphub.h
openbsc_HEADERS = gsm_04_08.h meas_rep.h bsc_api.h
openbscdir = $(includedir)/openbsc
diff --git a/openbsc/include/openbsc/debug.h b/openbsc/include/openbsc/debug.h
index 19d8fc2..189ca47 100644
--- a/openbsc/include/openbsc/debug.h
+++ b/openbsc/include/openbsc/debug.h
@@ -33,6 +33,7 @@ enum {
DCTRL,
DSMPP,
DFILTER,
+ DGTPHUB,
Debug_LastEntry,
};
diff --git a/openbsc/include/openbsc/gtphub.h b/openbsc/include/openbsc/gtphub.h
new file mode 100644
index 0000000..ebd4058
--- /dev/null
+++ b/openbsc/include/openbsc/gtphub.h
@@ -0,0 +1,345 @@
+/* GTP Hub Implementation */
+
+/* (C) 2015 by sysmocom s.f.m.c. GmbH <[email protected]>
+ * All Rights Reserved
+ *
+ * Author: Neels Hofmeyr
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <sys/socket.h>
+
+#include <osmocom/core/select.h>
+#include <osmocom/core/timer.h>
+
+
+/* support */
+
+/* TODO move to osmocom/core/socket.c ? */
+#include <netdb.h> /* for IPPROTO_* etc */
+struct osmo_sockaddr {
+ struct sockaddr_storage a;
+ socklen_t l;
+};
+
+/* TODO move to osmocom/core/socket.c ? */
+/*! \brief Initialize a sockaddr
+ * \param[out] addr Valid osmo_sockaddr pointer to write result to
+ * \param[in] family Address Family like AF_INET, AF_INET6, AF_UNSPEC
+ * \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM
+ * \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP
+ * \param[in] host Remote host name or IP address in string form
+ * \param[in] port Remote port number in host byte order
+ * \returns 0 on success, otherwise an error code (from getaddrinfo()).
+ *
+ * Copy the first result from a getaddrinfo() call with the given parameters to
+ * *addr and *addr_len. On error, do not change *addr and return nonzero.
+ */
+int osmo_sockaddr_init(struct osmo_sockaddr *addr,
+ uint16_t family, uint16_t type, uint8_t proto,
+ const char *host, uint16_t port);
+
+/* Conveniently pass AF_UNSPEC, SOCK_DGRAM and IPPROTO_UDP to
+ * osmo_sockaddr_init(). */
+static inline int osmo_sockaddr_init_udp(struct osmo_sockaddr *addr,
+ const char *host, uint16_t port)
+{
+ return osmo_sockaddr_init(addr, AF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP,
host, port);
+}
+
+/*! \brief convert sockaddr to human readable string.
+ * \param[out] addr_str Valid pointer to a buffer of length addr_str_len.
+ * \param[in] addr_str_len Size of buffer addr_str points at.
+ * \param[out] port_str Valid pointer to a buffer of length port_str_len.
+ * \param[in] port_str_len Size of buffer port_str points at.
+ * \param[in] addr Binary representation as returned by osmo_sockaddr_init().
+ * \param[in] flags flags as passed to getnameinfo().
+ * \returns 0 on success, an error code on error.
+ *
+ * Return the IPv4 or IPv6 address string and the port (a.k.a. service) string
+ * representations of the given struct osmo_sockaddr in two caller provided
+ * char buffers. Flags of (NI_NUMERICHOST | NI_NUMERICSERV) return numeric
+ * address and port. Either one of addr_str or port_str may be NULL, in which
+ * case nothing is returned there.
+ *
+ * See also osmo_sockaddr_to_str() (less flexible, but much more convenient).
*/
+int osmo_sockaddr_to_strs(char *addr_str, size_t addr_str_len,
+ char *port_str, size_t port_str_len,
+ const struct osmo_sockaddr *addr,
+ int flags);
+
+
+/*! \brief conveniently concatenate the parts returned by
osmo_sockaddr_to_strs().
+ * \param[in] addr Binary representation as returned by osmo_sockaddr_init().
+ * \param[in] buf A buffer to use for string operations.
+ * \param[in] buf_len Length of the buffer.
+ * \returns Address string (in buffer).
+ *
+ * Compose a string of the numeric IP-address and port represented by *addr of
+ * the form "<ip-addr> port <port>". The returned string is valid until the
+ * next invocation of this function.
+ */
+const char *osmo_sockaddr_to_strb(const struct osmo_sockaddr *addr,
+ char *buf, size_t buf_len);
+
+/*! \brief conveniently return osmo_sockaddr_to_strb() in a static buffer.
+ * \param[in] addr Binary representation as returned by osmo_sockaddr_init().
+ * \returns Address string in static buffer.
+ *
+ * See osmo_sockaddr_to_strb().
+ *
+ * Note: only one osmo_sockaddr_to_str() call will work per print/log
+ * statement. For two or more, use osmo_sockaddr_to_strb() with a separate
+ * buffer each.
+ */
+const char *osmo_sockaddr_to_str(const struct osmo_sockaddr *addr);
+
+/*! \brief compare two osmo_sockaddr.
+ * \param[in] a The first address to compare.
+ * \param[in] b The other address to compare.
+ * \returns 0 if equal, otherwise -1 or 1.
+ */
+int osmo_sockaddr_cmp(const struct osmo_sockaddr *a, const struct
osmo_sockaddr *b);
+
+/*! \brief Overwrite *dst with *src.
+ * Like memcpy(), but copy only the valid bytes. */
+void osmo_sockaddr_copy(struct osmo_sockaddr *dst, const struct osmo_sockaddr
*src);
+
+
+/* general */
+
+enum gtphub_port_idx {
+ GTPH_PORT_CTRL = 0,
+ GTPH_PORT_USER = 1,
+ GTPH_PORT_N
+};
+
+extern const char* const gtphub_port_idx_names[GTPH_PORT_N];
+
+
+/* A number map assigns a "random" mapped number to each user provided number.
+ * If the same number is requested multiple times, the same mapped number is
+ * returned.
+ *
+ * Number maps plug into possibly shared pools and expiry queues, for example:
+ *
+ * mapA -----------+-> pool1 <-+-- mapB
+ * {10->1, 11->5} | {1, 2, 3, ...} | {10->2, 11->3}
+ * | |
+ * | |
+ * /-> \-> expiry1 <-/
+ * | (30 seconds)
+ * |
+ * mapC -------+-----> pool2 <-+-- mapD
+ * {10->1, 11->3} {1, 2, 3, ...} | {10->2, 11->5}
+ * |
+ * expiry2 <-/
+ * (60 seconds)
+ *
+ * A map contains mappings ("10->1"). Each map needs a number pool, which can
+ * be shared with other maps. Each new mapping receives a number from the pool,
+ * which is then unavailable to any other map using the same pool.
+ *
+ * A map may point at an expiry queue, in which case all mappings added to it
+ * are also appended to the expiry queue (using a separate llist entry in the
+ * mapping). Any number of maps may submit to the same expiry queue, if they
+ * desire the same expiry timeout. An expiry queue stores the mappings in
+ * chronological order, so that expiry checking is needed only from the start
+ * of the queue; hence only mappings with identical expiry timeout can be added
+ * to the same expiry queue. Upon expiry, a mapping is dropped from the map it
+ * was submitted at. nr_map_expiry_tick() needs to be called regularly for
+ * each expiry queue.
+ *
+ * A nr_mapping can be embedded in a larger struct: each mapping can have a
+ * distinct destructor (del_cb), and each del_cb can figure out the container
+ * struct's address and free that upon expiry or manual deletion. So in expiry
+ * queues (and even maps), mappings of different container types can be mixed.
+ * This can help to drastically reduce the amount of unnecessary visits during
+ * expiry checking, for the case that no expiry is pending. An expiry queue
+ * always knows which mappings to expire next, because they are right at the
+ * start of its list.
+ *
+ * Mapping allocation and a del_cb are provided by the caller. If del_cb is
+ * NULL, no deallocation will be done (allowing statically allocated entries).
+ */
+/* TODO at some point I thought the allocation & del_cb complexity was
+ * needed/helpful, but by now it seems like overkill. Maybe lose that again. */
+
+typedef int nr_t;
+
+/* Generator for unused numbers. So far this counts upwards from zero, but the
+ * implementation may change in the future. Treat this like an opaque struct.
+ * If this becomes random, the tests need to be fixed. */
+struct nr_pool {
+ nr_t last_nr;
+ /* TODO add min, max, for safe wrapping */
+};
+
+struct nr_mapping;
+typedef void (*nr_mapping_del_cb_t)(struct nr_mapping *);
+
+struct nr_mapping {
+ struct llist_head entry;
+ struct llist_head expiry_entry;
+ time_t expiry;
+
+ void *origin;
+ nr_t orig;
+ nr_t repl;
+
+ nr_mapping_del_cb_t del_cb;
+};
+
+struct nr_map_expiry {
+ int expiry_in_seconds;
+ struct llist_head mappings;
+};
+
+struct nr_map {
+ struct nr_pool *pool; /* multiple nr_maps can share a nr_pool. */
+ struct nr_map_expiry *expiry;
+ struct llist_head mappings;
+};
+
+
+void nr_pool_init(struct nr_pool *pool);
+
+/* Return the next unused number from the nr_pool. */
+nr_t nr_pool_next(struct nr_pool *pool);
+
+/* Initialize the nr_mapping to zero/empty values. */
+void nr_mapping_init(struct nr_mapping *mapping);
+
+/* Remove the given mapping from its parent map and expiry queue, and call
+ * mapping->del_cb, if set. */
+void nr_mapping_del(struct nr_mapping *mapping);
+
+/* Initialize an expiry queue exq. */
+void nr_map_expiry_init(struct nr_map_expiry *exq, int expiry_in_seconds);
+
+/* Add a new mapping, or restart the expiry timeout for an already listed
mapping. */
+void nr_map_expiry_add(struct nr_map_expiry *exq, struct nr_mapping *mapping,
time_t now);
+
+/* Carry out due expiry of mappings. Must be invoked regularly.
+ * 'now' is the current clock count in seconds and must correspond to the clock
+ * count passed to nr_map_add(). A monotonous clock counter should be used. */
+int nr_map_expiry_tick(struct nr_map_expiry *exq, time_t now);
+
+/* Initialize an (already allocated) nr_map, and set the map's number pool.
+ * Multiple nr_map instances may use the same nr_pool. Set the nr_map's expiry
+ * queue to exq, so that all added mappings are automatically expired after the
+ * time configured in exq. exq may be NULL to disable automatic expiry. */
+void nr_map_init(struct nr_map *map, struct nr_pool *pool,
+ struct nr_map_expiry *exq);
+
+/* Add a new entry to the map. mapping->orig, mapping->origin and
+ * mapping->del_cb must be set before calling this function. The remaining
+ * fields of *mapping will be overwritten. mapping->repl is set to the next
+ * available mapped number from map->pool. 'now' is the current clock count in
+ * seconds; if no map->expiry is used, just pass 0 for 'now'. */
+void nr_map_add(struct nr_map *map, struct nr_mapping *mapping,
+ time_t now);
+
+/* Return a known mapping from nr_orig and the given origin. If nr_orig is
+ * unknown, return NULL. */
+struct nr_mapping *nr_map_get(const struct nr_map *map,
+ void *origin, nr_t nr_orig);
+
+/* Return a known mapping to nr_repl. If nr_repl is unknown, return NULL. */
+struct nr_mapping *nr_map_get_inv(const struct nr_map *map, nr_t nr_repl);
+
+/* Remove all mappings from map. */
+void nr_map_clear(struct nr_map *map);
+
+/* Return 1 if map has no entries, 0 otherwise. */
+int nr_map_empty(const struct nr_map *map);
+
+
+/* config */
+
+static const int GTPH_SEQ_MAPPING_EXPIRY_SECS = 30; /* TODO is there a spec
for this? */
+static const int GTPH_TEI_MAPPING_EXPIRY_MINUTES = 6 * 60; /* TODO is there a
spec for this? */
+
+struct gtphub_cfg_addr {
+ const char *addr_str;
+ uint16_t port;
+};
+
+struct gtphub_cfg_bind {
+ struct gtphub_cfg_addr bind;
+};
+
+struct gtphub_cfg {
+ struct gtphub_cfg_bind to_sgsns[GTPH_PORT_N];
+ struct gtphub_cfg_bind to_ggsns[GTPH_PORT_N];
+ struct gtphub_cfg_addr sgsn_proxy[GTPH_PORT_N];
+ struct gtphub_cfg_addr ggsn_proxy[GTPH_PORT_N];
+};
+
+
+/* state */
+
+struct gtphub_peer {
+ struct llist_head entry;
+
+ struct osmo_sockaddr addr;
+ struct nr_map tei_map;
+ struct nr_pool seq_pool;
+ struct nr_map seq_map;
+ unsigned int ref_count; /* references from other peers' seq_maps */
+ struct gtphub_peer *association[GTPH_PORT_N]; /* One points to "this" */
+};
+
+struct gtphub_bind {
+ struct osmo_fd ofd;
+ struct nr_pool tei_pool;
+
+ /* list of struct gtphub_peer */
+ struct llist_head peers;
+};
+
+struct gtphub {
+ struct gtphub_bind to_sgsns[GTPH_PORT_N];
+ struct gtphub_bind to_ggsns[GTPH_PORT_N];
+
+ /* pointers to an entry of to_sgsns[x].peers */
+ struct gtphub_peer *sgsn_proxy[GTPH_PORT_N];
+
+ /* pointers to an entry of to_ggsns[x].peers */
+ struct gtphub_peer *ggsn_proxy[GTPH_PORT_N];
+
+ struct osmo_timer_list gc_timer;
+ struct nr_map_expiry expire_seq_maps;
+ struct nr_map_expiry expire_tei_maps;
+};
+
+struct gtp_packet_desc;
+
+
+/* api */
+
+int gtphub_vty_init(void);
+int gtphub_cfg_read(struct gtphub_cfg *cfg, const char *config_file);
+
+/* Initialize and start gtphub: bind to ports, run expiry timers. */
+int gtphub_start(struct gtphub *hub, struct gtphub_cfg *cfg);
+
+time_t gtphub_now(void);
+
+/* Remove expired items, empty peers, ... */
+void gtphub_gc(struct gtphub *hub, time_t now);
diff --git a/openbsc/include/openbsc/vty.h b/openbsc/include/openbsc/vty.h
index 818a20e..bc30e23 100644
--- a/openbsc/include/openbsc/vty.h
+++ b/openbsc/include/openbsc/vty.h
@@ -36,6 +36,7 @@ enum bsc_vty_node {
BSC_NODE,
SMPP_NODE,
SMPP_ESME_NODE,
+ GTPHUB_NODE,
};
extern int bsc_vty_is_config_node(struct vty *vty, int node);
diff --git a/openbsc/src/gprs/Makefile.am b/openbsc/src/gprs/Makefile.am
index c8e3696..b2d1774 100644
--- a/openbsc/src/gprs/Makefile.am
+++ b/openbsc/src/gprs/Makefile.am
@@ -11,6 +11,7 @@ noinst_HEADERS = gprs_sndcp.h
bin_PROGRAMS = osmo-gbproxy
if HAVE_LIBGTP
+bin_PROGRAMS += osmo-gtphub
if HAVE_LIBCARES
bin_PROGRAMS += osmo-sgsn
endif
@@ -33,3 +34,8 @@ osmo_sgsn_LDADD = \
$(top_builddir)/src/libcommon/libcommon.a \
-lgtp $(OSMO_LIBS) $(LIBOSMOABIS_LIBS) $(LIBCARES_LIBS)
\
$(LIBCRYPTO_LIBS) -lrt
+
+osmo_gtphub_SOURCES = gtphub_main.c gtphub.c gtphub_sep.c gtphub_vty.c
+osmo_gtphub_LDADD = \
+ $(top_builddir)/src/libcommon/libcommon.a \
+ -lgtp $(LIBOSMOCORE_LIBS) $(LIBOSMOVTY_LIBS) -lrt
diff --git a/openbsc/src/gprs/gtphub.c b/openbsc/src/gprs/gtphub.c
new file mode 100644
index 0000000..19246e2
--- /dev/null
+++ b/openbsc/src/gprs/gtphub.c
@@ -0,0 +1,1794 @@
+/* GTP Hub Implementation */
+
+/* (C) 2015 by sysmocom s.f.m.c. GmbH <[email protected]>
+ * All Rights Reserved
+ *
+ * Author: Neels Hofmeyr
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <string.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <time.h>
+#include <limits.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <gtp.h>
+#include <gtpie.h>
+
+#include <openbsc/gtphub.h>
+#include <openbsc/debug.h>
+
+#include <osmocom/core/utils.h>
+#include <osmocom/core/logging.h>
+#include <osmocom/core/socket.h>
+
+#define GTPHUB_DEBUG 1
+
+static const int GTPH_GC_TICK_SECONDS = 1;
+
+void *osmo_gtphub_ctx;
+
+#define LOGERR(fmt, args...) \
+ LOGP(DGTPHUB, LOGL_ERROR, fmt, ##args)
+
+#define LOG(fmt, args...) \
+ LOGP(DGTPHUB, LOGL_NOTICE, fmt, ##args)
+
+#define ZERO_STRUCT(struct_pointer) memset(struct_pointer, '\0',
sizeof(*(struct_pointer)))
+
+/* TODO move this to osmocom/core/select.h ? */
+typedef int (*osmo_fd_cb_t)(struct osmo_fd *fd, unsigned int what);
+
+/* TODO move this to osmocom/core/linuxlist.h ? */
+#define __llist_first(head) (((head)->next == (head)) ? NULL : (head)->next)
+#define llist_first(head, type, entry) llist_entry(__llist_first(head), type,
entry)
+
+/* TODO move GTP header stuff to openggsn/gtp/ ? See gtp_decaps*() */
+
+enum gtp_rc {
+ GTP_RC_UNKNOWN = 0,
+ GTP_RC_TINY = 1, /* no IEs (like ping/pong) */
+ GTP_RC_PDU = 2, /* a real packet with IEs */
+
+ GTP_RC_TOOSHORT = -1,
+ GTP_RC_UNSUPPORTED_VERSION = -2,
+ GTP_RC_INVALID_IE = -3,
+};
+
+struct gtp_packet_desc {
+ union gtp_packet *data;
+ int data_len;
+ int header_len;
+ int version;
+ int rc; /* enum gtp_rc */
+ unsigned int port_idx;
+ union gtpie_member *ie[GTPIE_SIZE];
+};
+
+/* Validate GTP version 0 data; analogous to validate_gtp1_header(), see there.
+ */
+void validate_gtp0_header(struct gtp_packet_desc *p)
+{
+ const struct gtp0_header *pheader = &(p->data->gtp0.h);
+ p->rc = GTP_RC_UNKNOWN;
+ p->header_len = 0;
+
+ OSMO_ASSERT(p->data_len >= 1);
+ OSMO_ASSERT(p->version == 0);
+
+ if (p->data_len < GTP0_HEADER_SIZE) {
+ LOGERR("GTP0 packet too short: %d\n", p->data_len);
+ p->rc = GTP_RC_TOOSHORT;
+ return;
+ }
+
+ if (p->data_len == GTP0_HEADER_SIZE) {
+ p->rc = GTP_RC_TINY;
+ p->header_len = GTP0_HEADER_SIZE;
+ return;
+ }
+
+ /* Check packet length field versus length of packet */
+ if (p->data_len != (ntoh16(pheader->length) + GTP0_HEADER_SIZE)) {
+ LOGERR("GTP packet length field (%d + %d) does not match"
+ " actual length (%d)\n",
+ GTP0_HEADER_SIZE, (int)ntoh16(pheader->length),
+ p->data_len);
+ p->rc = GTP_RC_TOOSHORT;
+ return;
+ }
+
+ LOG("GTP v0 TID = %" PRIu64 "\n", pheader->tid);
+ p->header_len = GTP0_HEADER_SIZE;
+ p->rc = GTP_RC_PDU;
+}
+
+/* Validate GTP version 1 data, and update p->rc with the result, as well as
+ * p->header_len in case of a valid header. */
+void validate_gtp1_header(struct gtp_packet_desc *p)
+{
+ const struct gtp1_header_long *pheader = &(p->data->gtp1l.h);
+ p->rc = GTP_RC_UNKNOWN;
+ p->header_len = 0;
+
+ OSMO_ASSERT(p->data_len >= 1);
+ OSMO_ASSERT(p->version == 1);
+
+ if ((p->data_len < GTP1_HEADER_SIZE_LONG)
+ && (p->data_len != GTP1_HEADER_SIZE_SHORT)){
+ LOGERR("GTP packet too short: %d\n", p->data_len);
+ p->rc = GTP_RC_TOOSHORT;
+ return;
+ }
+
+ LOG("|GTPv1\n");
+ LOG("| type = %" PRIu8 " 0x%02" PRIx8 "\n",
+ pheader->type, pheader->type);
+ LOG("| length = %" PRIu16 " 0x%04" PRIx16 "\n",
+ ntoh16(pheader->length), ntoh16(pheader->length));
+ LOG("| TEI = %" PRIu32 " 0x%08" PRIx32 "\n",
+ ntoh32(pheader->tei), ntoh32(pheader->tei));
+ LOG("| seq = %" PRIu16 " 0x%04" PRIx16 "\n",
+ ntoh16(pheader->seq), ntoh16(pheader->seq));
+ LOG("| npdu = %" PRIu8 " 0x%02" PRIx8 "\n",
+ pheader->npdu, pheader->npdu);
+ LOG("| next = %" PRIu8 " 0x%02" PRIx8 "\n",
+ pheader->next, pheader->next);
+
+ if (p->data_len <= GTP1_HEADER_SIZE_LONG) {
+ p->rc = GTP_RC_TINY;
+ p->header_len = GTP1_HEADER_SIZE_SHORT;
+ return;
+ }
+
+ /* Check packet length field versus length of packet */
+ if (p->data_len != (ntoh16(pheader->length) + GTP1_HEADER_SIZE_SHORT)) {
+ LOGERR("GTP packet length field (%d + %d) does not match"
+ " actual length (%d)\n",
+ GTP1_HEADER_SIZE_SHORT, (int)ntoh16(pheader->length),
+ p->data_len);
+ p->rc = GTP_RC_TOOSHORT;
+ return;
+ }
+
+ p->rc = GTP_RC_PDU;
+ p->header_len = GTP1_HEADER_SIZE_LONG;
+}
+
+/* Examine whether p->data of size p->data_len has a valid GTP header. Set
+ * p->version, p->rc and p->header_len. On error, p->rc <= 0 (see enum
+ * gtp_rc). p->data must point at a buffer with p->data_len set. */
+void validate_gtp_header(struct gtp_packet_desc *p)
+{
+ p->rc = GTP_RC_UNKNOWN;
+
+ /* Need at least 1 byte in order to check version */
+ if (p->data_len < 1) {
+ LOGERR("Discarding packet - too small: %d\n", p->data_len);
+ p->rc = GTP_RC_TOOSHORT;
+ return;
+ }
+
+ p->version = p->data->flags >> 5;
+
+ switch (p->version) {
+ case 0:
+ validate_gtp0_header(p);
+ break;
+ case 1:
+ validate_gtp1_header(p);
+ break;
+ default:
+ LOGERR("Unsupported GTP version: %d\n", p->version);
+ p->rc = GTP_RC_UNSUPPORTED_VERSION;
+ break;
+ }
+}
+
+
+/* Return the value of the i'th IMSI IEI by copying to *imsi.
+ * The first IEI is reached by passing i = 0.
+ * imsi must point at allocated space of (at least) 8 bytes.
+ * Return 1 on success, or 0 if not found. */
+static int get_ie_imsi(union gtpie_member *ie[], uint8_t *imsi, int i)
+{
+ return gtpie_gettv0(ie, GTPIE_IMSI, i, imsi, 8) == 0;
+}
+
+/* Analogous to get_ie_imsi(). nsapi must point at a single uint8_t. */
+static int get_ie_nsapi(union gtpie_member *ie[], uint8_t *nsapi, int i)
+{
+ return gtpie_gettv1(ie, GTPIE_NSAPI, i, nsapi) == 0;
+}
+
+static char imsi_digit_to_char(uint8_t nibble)
+{
+ nibble &= 0x0f;
+ if (nibble > 9)
+ return (nibble == 0x0f) ? '\0' : '?';
+ return '0' + nibble;
+}
+
+/* Return a human readable IMSI string, in a static buffer.
+ * imsi must point at 8 octets of IMSI IE encoded IMSI data. */
+static const char *imsi_to_str(uint8_t *imsi)
+{
+ static char str[17];
+ int i;
+
+ for (i = 0; i < 8; i++) {
+ str[2*i] = imsi_digit_to_char(imsi[i]);
+ str[2*i + 1] = imsi_digit_to_char(imsi[i] >> 4);
+ }
+ str[16] = '\0';
+ return str;
+}
+
+/* Validate header, and index information elements. Write decoded packet
+ * information to *res. res->data will point at the given data buffer. On
+ * error, p->rc is set <= 0 (see enum gtp_rc). */
+static void gtp_decode(const uint8_t *data, int data_len,
+ unsigned int from_port_idx,
+ struct gtp_packet_desc *res)
+{
+ ZERO_STRUCT(res);
+ res->data = (union gtp_packet*)data;
+ res->data_len = data_len;
+ res->port_idx = from_port_idx;
+
+ validate_gtp_header(res);
+
+ if (res->rc <= 0) {
+ LOGERR("INVALID: dropping GTP packet.\n");
+ return;
+ }
+
+ LOG("Valid GTP header (v%d)\n", res->version);
+
+ if (res->rc != GTP_RC_PDU) {
+ LOG("no IEs in this GTP packet\n");
+ return;
+ }
+
+ if (gtpie_decaps(res->ie, res->version,
+ (void*)(data + res->header_len),
+ res->data_len - res->header_len) != 0) {
+ res->rc = GTP_RC_INVALID_IE;
+ return;
+ }
+
+#if GTPHUB_DEBUG
+ int i;
+
+ for (i = 0; i < 10; i++) {
+ uint8_t imsi[8];
+ if (!get_ie_imsi(res->ie, imsi, i))
+ break;
+ LOG("| IMSI %s\n", imsi_to_str(imsi));
+ }
+
+ for (i = 0; i < 10; i++) {
+ uint8_t nsapi;
+ if (!get_ie_nsapi(res->ie, &nsapi, i))
+ break;
+ LOG("| NSAPI %d\n", (int)nsapi);
+ }
+
+ for (i = 0; i < 10; i++) {
+ unsigned int addr_len;
+ struct in_addr addr;
+ if (gtpie_gettlv(res->ie, GTPIE_GSN_ADDR, i, &addr_len, &addr,
+ sizeof(addr)) != 0)
+ break;
+ LOG("| addr %s\n", inet_ntoa(addr));
+ }
+
+ for (i = 0; i < 10; i++) {
+ uint32_t tei;
+ if (gtpie_gettv4(res->ie, GTPIE_TEI_DI, i, &tei) != 0)
+ break;
+ LOG("| TEI DI (USER) %" PRIu32 " 0x%08" PRIx32 "\n",
+ tei, tei);
+ }
+
+ for (i = 0; i < 10; i++) {
+ uint32_t tei;
+ if (gtpie_gettv4(res->ie, GTPIE_TEI_C, i, &tei) != 0)
+ break;
+ LOG("| TEI (CTRL) %" PRIu32 " 0x%08" PRIx32 "\n",
+ tei, tei);
+ }
+#endif
+}
+
+
+/* general */
+
+const char* const gtphub_port_idx_names[GTPH_PORT_N] = {
+ "CTRL",
+ "USER",
+};
+
+time_t gtphub_now(void)
+{
+ struct timespec now_tp;
+ OSMO_ASSERT(clock_gettime(CLOCK_MONOTONIC, &now_tp) >= 0);
+ return now_tp.tv_sec;
+}
+
+
+/* nr_map, nr_pool */
+
+void nr_pool_init(struct nr_pool *pool)
+{
+ *pool = (struct nr_pool){};
+}
+
+nr_t nr_pool_next(struct nr_pool *pool)
+{
+ pool->last_nr ++;
+
+ OSMO_ASSERT(pool->last_nr > 0);
+ /* TODO: gracefully handle running out of TEIs. */
+ /* TODO: random TEIs. */
+
+ return pool->last_nr;
+}
+
+void nr_map_init(struct nr_map *map, struct nr_pool *pool,
+ struct nr_map_expiry *exq)
+{
+ ZERO_STRUCT(map);
+ map->pool = pool;
+ map->expiry = exq;
+ INIT_LLIST_HEAD(&map->mappings);
+}
+
+void nr_mapping_init(struct nr_mapping *m)
+{
+ ZERO_STRUCT(m);
+ INIT_LLIST_HEAD(&m->entry);
+ INIT_LLIST_HEAD(&m->expiry_entry);
+}
+
+void nr_map_add(struct nr_map *map, struct nr_mapping *mapping, time_t now)
+{
+ /* Generate a mapped number */
+ mapping->repl = nr_pool_next(map->pool);
+
+ /* Add to the tail to always yield a list sorted by expiry, in
+ * ascending order. */
+ llist_add_tail(&mapping->entry, &map->mappings);
+ if (map->expiry)
+ nr_map_expiry_add(map->expiry, mapping, now);
+}
+
+void nr_map_clear(struct nr_map *map)
+{
+ struct nr_mapping *m;
+ struct nr_mapping *n;
+ llist_for_each_entry_safe(m, n, &map->mappings, entry) {
+ nr_mapping_del(m);
+ }
+}
+
+int nr_map_empty(const struct nr_map *map)
+{
+ return llist_empty(&map->mappings);
+}
+
+struct nr_mapping *nr_map_get(const struct nr_map *map,
+ void *origin, nr_t nr_orig)
+{
+ struct nr_mapping *mapping;
+ llist_for_each_entry(mapping, &map->mappings, entry) {
+ if ((mapping->origin == origin)
+ && (mapping->orig == nr_orig))
+ return mapping;
+ }
+ /* Not found. */
+ return NULL;
+}
+
+struct nr_mapping *nr_map_get_inv(const struct nr_map *map, nr_t nr_repl)
+{
+ struct nr_mapping *mapping;
+ llist_for_each_entry(mapping, &map->mappings, entry) {
+ if (mapping->repl == nr_repl) {
+ return mapping;
+ }
+ }
+ /* Not found. */
+ return NULL;
+}
+
+void nr_mapping_del(struct nr_mapping *mapping)
+{
+ OSMO_ASSERT(mapping);
+ llist_del(&mapping->entry);
+ llist_del(&mapping->expiry_entry);
+ if (mapping->del_cb)
+ (mapping->del_cb)(mapping);
+}
+
+void nr_map_expiry_init(struct nr_map_expiry *exq, int expiry_in_seconds)
+{
+ ZERO_STRUCT(exq);
+ exq->expiry_in_seconds = expiry_in_seconds;
+ INIT_LLIST_HEAD(&exq->mappings);
+}
+
+void nr_map_expiry_add(struct nr_map_expiry *exq, struct nr_mapping *mapping,
+ time_t now)
+{
+ mapping->expiry = now + exq->expiry_in_seconds;
+
+ /* Add/move to the tail to always sort by expiry, ascending. */
+ llist_del(&mapping->expiry_entry);
+ llist_add_tail(&mapping->expiry_entry, &exq->mappings);
+}
+
+int nr_map_expiry_tick(struct nr_map_expiry *exq, time_t now)
+{
+ int expired = 0;
+ struct nr_mapping *m;
+ struct nr_mapping *n;
+ llist_for_each_entry_safe(m, n, &exq->mappings, expiry_entry) {
+ if (m->expiry <= now) {
+ nr_mapping_del(m);
+ expired ++;
+ }
+ else {
+ /* The items are added sorted by expiry. So when we hit
+ * an unexpired entry, only more unexpired ones will
+ * follow. */
+ break;
+ }
+ }
+ return expired;
+}
+
+
+/* gtphub */
+
+/* Remove a gtphub_peer from its list and free it. */
+static void gtphub_peer_del(struct gtphub_peer *peer);
+
+/* From the information in the gtp_packet_desc, return the address of a GGSN.
+ * Return -1 on error. */
+static struct gtphub_peer *gtphub_resolve_ggsn(struct gtphub *hub,
+ struct gtp_packet_desc *p,
+ unsigned int port_idx);
+
+/* (wrapped by unit test) */
+int gtphub_resolve_ggsn_addr(struct gtphub *hub,
+ struct osmo_sockaddr *result,
+ struct gtp_packet_desc *p);
+
+/* comment: see at definition */
+static struct gtphub_peer *gtphub_peer_new(struct gtphub *hub,
+ struct gtphub_bind bind[],
+ unsigned int port_idx,
+ const char *addr_str,
+ uint16_t port,
+ const char *other_addr_str,
+ uint16_t other_port);
+
+static struct gtphub_peer *gtphub_peer_new_from_sockaddr(struct gtphub *hub,
+ struct gtphub_bind
bind[],
+ unsigned int port_idx,
+ const struct
osmo_sockaddr *addr,
+ int port_override);
+
+static void gtphub_zero(struct gtphub *hub)
+{
+ ZERO_STRUCT(hub);
+}
+
+static int gtphub_sock_init(struct osmo_fd *ofd,
+ const struct gtphub_cfg_addr *addr,
+ osmo_fd_cb_t cb,
+ void *data,
+ int ofd_id)
+{
+ if (!addr->addr_str) {
+ LOGERR("Cannot bind: empty address.\n");
+ return -1;
+ }
+ if (!addr->port) {
+ LOGERR("Cannot bind: zero port not permitted.\n");
+ return -1;
+ }
+
+ ofd->when = BSC_FD_READ;
+ ofd->cb = cb;
+ ofd->data = data;
+ ofd->priv_nr = ofd_id;
+
+ int rc;
+ rc = osmo_sock_init_ofd(ofd,
+ AF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP,
+ addr->addr_str, addr->port,
+ OSMO_SOCK_F_BIND);
+ if (rc < 1) {
+ LOGERR("Cannot bind to %s port %d (rc %d)\n",
+ addr->addr_str, (int)addr->port, rc);
+ return -1;
+ }
+
+ return 0;
+}
+
+static void gtphub_gtp_bind_init(struct gtphub_bind *b)
+{
+ ZERO_STRUCT(b);
+
+ nr_pool_init(&b->tei_pool);
+ INIT_LLIST_HEAD(&b->peers);
+}
+
+static int gtphub_gtp_bind_start(struct gtphub_bind *b,
+ const struct gtphub_cfg_bind *cfg,
+ osmo_fd_cb_t cb, void *cb_data,
+ unsigned int ofd_id)
+{
+ if (gtphub_sock_init(&b->ofd, &cfg->bind, cb, cb_data, ofd_id) != 0)
+ return -1;
+ return 0;
+}
+
+/* Recv datagram from from->fd, optionally write sender's address to
*from_addr.
+ * Return the number of bytes read, zero on error. */
+static int gtphub_read(const struct osmo_fd *from,
+ struct osmo_sockaddr *from_addr,
+ uint8_t *buf, size_t buf_len)
+{
+ /* recvfrom requires the available length to be set in *from_addr_len.
*/
+ if (from_addr)
+ from_addr->l = sizeof(from_addr->a);
+
+ errno = 0;
+ ssize_t received = recvfrom(from->fd, buf, buf_len, 0,
+ (struct sockaddr*)&from_addr->a,
&from_addr->l);
+ /* TODO use recvmsg and get a MSG_TRUNC flag to make sure the message
+ * is not truncated. Then maybe reduce buf's size. */
+
+ if (received <= 0) {
+ if (errno != EAGAIN)
+ LOGERR("error: %s\n", strerror(errno));
+ return 0;
+ }
+
+ if (from_addr) {
+ LOG("from %s\n", osmo_sockaddr_to_str(from_addr));
+ }
+
+ if (received <= 0) {
+ LOGERR("error: %s\n", strerror(errno));
+ return 0;
+ }
+
+ LOG("Received %d\n%s\n", (int)received, osmo_hexdump(buf, received));
+ return received;
+}
+
+inline void gtphub_peer_ref_count_inc(struct gtphub_peer *p)
+{
+ OSMO_ASSERT(p->ref_count < UINT_MAX);
+ p->ref_count++;
+}
+
+inline void gtphub_peer_ref_count_dec(struct gtphub_peer *p)
+{
+ OSMO_ASSERT(p->ref_count > 0);
+ p->ref_count--;
+}
+
+inline uint16_t get_seq(struct gtp_packet_desc *p)
+{
+ OSMO_ASSERT(p->version == 1);
+ return ntoh16(p->data->gtp1l.h.seq);
+}
+
+inline void set_seq(struct gtp_packet_desc *p, uint16_t seq)
+{
+ OSMO_ASSERT(p->version == 1);
+ p->data->gtp1l.h.seq = hton16(seq);
+}
+
+inline uint32_t get_tei(struct gtp_packet_desc *p)
+{
+ OSMO_ASSERT(p->version == 1);
+ return ntoh32(p->data->gtp1l.h.tei);
+}
+
+inline void set_tei(struct gtp_packet_desc *p, uint32_t tei)
+{
+ OSMO_ASSERT(p->version == 1);
+ p->data->gtp1l.h.tei = hton32(tei);
+}
+
+static void gtphub_mapping_del_cb(struct nr_mapping *nrm);
+
+static struct nr_mapping *gtphub_mapping_new()
+{
+ struct nr_mapping *nrm;
+ nrm = talloc_zero(osmo_gtphub_ctx, struct nr_mapping);
+ OSMO_ASSERT(nrm);
+
+ nr_mapping_init(nrm);
+ nrm->del_cb = gtphub_mapping_del_cb;
+ return nrm;
+}
+
+static void gtphub_mapping_del_cb(struct nr_mapping *nrm)
+{
+ struct gtphub_peer *from = nrm->origin;
+ OSMO_ASSERT(from);
+ LOG("expired: %d: nr mapping from %s: %d->%d\n",
+ (int)nrm->expiry,
+ osmo_sockaddr_to_str(&from->addr),
+ (int)nrm->orig, (int)nrm->repl);
+
+ gtphub_peer_ref_count_dec(from);
+ talloc_free(nrm);
+}
+
+static struct nr_mapping *gtphub_mapping_have(struct nr_map *map,
+ struct gtphub_peer *from,
+ uint16_t orig_nr)
+{
+ struct nr_mapping *nrm;
+
+ nrm = nr_map_get(map, from, orig_nr);
+
+ if (!nrm) {
+ nrm = gtphub_mapping_new();
+ nrm->orig = orig_nr;
+ nrm->origin = from;
+ nr_map_add(map, nrm, gtphub_now());
+ gtphub_peer_ref_count_inc(from);
+ LOG("peer %p: MAP %d --> %d\n", from, (int)(nrm->orig),
(int)(nrm->repl));
+ }
+ else {
+ /* restart expiry timeout */
+ nr_map_expiry_add(map->expiry, nrm, gtphub_now());
+ }
+
+ OSMO_ASSERT(nrm);
+ return nrm;
+}
+
+static int gtphub_map_seq(struct gtp_packet_desc *p,
+ struct gtphub_peer *from_peer, struct gtphub_peer
*to_peer)
+{
+ /* Store a mapping in to_peer's map, so when we later receive a GTP
+ * packet back from to_peer, the seq nr can be unmapped back to its
+ * origin (from_peer here). */
+ struct nr_mapping *nrm;
+ nrm = gtphub_mapping_have(&to_peer->seq_map, from_peer, get_seq(p));
+
+ /* Change the GTP packet to yield the new, mapped seq nr */
+ set_seq(p, nrm->repl);
+
+ return 0;
+}
+
+static struct gtphub_peer *gtphub_unmap_seq(struct gtp_packet_desc *p,
+ struct gtphub_peer *responding_peer)
+{
+ OSMO_ASSERT(p->version == 1);
+ struct nr_mapping *nrm = nr_map_get_inv(&responding_peer->seq_map,
+ get_seq(p));
+ if (!nrm)
+ return NULL;
+ LOG("peer %p: UNMAP %d <-- %d\n", nrm->origin, (int)(nrm->orig),
(int)(nrm->repl));
+ set_seq(p, nrm->orig);
+ return nrm->origin;
+}
+
+static void gtphub_check_restart_counter(struct gtphub *hub,
+ struct gtp_packet_desc *p,
+ struct gtphub_peer *from)
+{
+ /* TODO */
+ /* If the peer is sending a Recovery IE (7.7.11) with a restart counter
+ * that doesn't match the peer's previously sent restart counter, clear
+ * that peer and cancel PDP contexts. */
+}
+
+static void gtphub_map_restart_counter(struct gtphub *hub,
+ struct gtp_packet_desc *p,
+ struct gtphub_peer *from,
+ struct gtphub_peer *to)
+{
+ /* TODO */
+}
+
+/* gtphub_map_ie_teis() and gtphub_unmap_header_tei():
+ *
+ * TEI mapping must happen symmetrically. An SGSN contacts gtphub instead of N
+ * GGSNs, and a GGSN replies to gtphub for N SGSNs. From either end, TEIs may
+ * collide: two GGSNs picking the same TEIs, or two SGSNs picking the same
+ * TEIs. Since the opposite side sees the sender address being gtphub's
+ * address, TEIs among the SGSNs, and among the GGSNs, must not overlap. If a
+ * peer sends a TEI already sent before from a peer of the same side, gtphub
+ * replaces it with a TEI not yet seen from that side and remembers the
+ * mapping.
+ *
+ * Consider two SGSNs A and B contacting two GGSNs C and D thru gtphub.
+ *
+ * A: Create PDP Ctx, I have TEI 1.
+ * ---> gtphub: A has TEI 1, sending 1 for C.
+ * ---> C: gtphub has TEI 1.
+ * <--- C: Reponse to TEI 1: I have TEI 11.
+ * <--- gtphub: ok, telling A: 11.
+ * A: gtphub's first TEI is 11. (1)
+ *
+ * B: Create PDP Ctx, I have TEIs 1.
+ * ---> gtphub: 1 already taken for C, sending 2 for B. (map)
+ * ---> C: gtphub also has 2.
+ * <--- C: Reponse to TEI 2: I have TEI 12.
+ * <--- gtphub: ok, TEI 2 is actually B with TEI 1. (unmap)
+ * B: gtphub's first TEI is 12, as far as I can tell.
+ *
+ * Now the second GGSN comes into play:
+ *
+ * A: Create PDP Ctx, I have TEI 2.
+ * ---> gtphub: A also has TEI 2, but for D, sending 1. (2)
+ * ---> D: gtphub has 1.
+ * <--- D: Reponse to TEI 1: I have TEI 11.
+ * <--- gtphub: from D, 1 is A. 11 already taken by C, sending 13. (3)
+ * A: gtphub also has TEI 13. (4)
+ *
+ * And some messages routed through:
+ *
+ * A: message to TEI 11, see (1).
+ * ---> gtphub: ok, telling C with TEI 11.
+ * ---> C: I see, 11 means reply with 1.
+ * <--- C: Response to TEI 1
+ * <--- gtphub: 1 from C is actually for A with TEI 1.
+ * A: ah, my TEI 1, thanks!
+ *
+ * A: message to TEI 13, see (4).
+ * ---> gtphub: ok, but not 13, D wanted TEI 11 instead, see (3).
+ * ---> D: I see, 11 means reply with 1.
+ * <--- D: Response to TEI 1
+ * <--- gtphub: 1 from D is actually for A with TEI 2, see (2).
+ * A: ah, my TEI 2, thanks!
+ *
+ * What if a GGSN initiates a request:
+ *
+ * <--- D: Request to gtphub TEI 1
+ * <--- gtphub: 1 from D is for A with 2, see (2).
+ * A: my TEI 2 means reply with 13.
+ * ---> gtphub: 13 was D with 11, see (3).
+ * ---> D: 11 from gtphub: a reply to my request for TEI 1.
+ *
+ * Note that usually, it's the sequence numbers that route a response back to
+ * the requesting peer. Nevertheless, the TEI mappings must be carried out to
+ * replace the TEIs in the GTP packet that is relayed.
+ *
+ * Also note: the TEI in the GTP header is "reversed" from the TEI in the IEs:
+ * the TEI in the header is used to send something *to* a peer, while the TEI
+ * in e.g. a Create PDP Context Request's IE is for routing messages *back*
+ * later. */
+
+static int gtphub_unmap_header_tei(struct gtphub_peer **to_peer_p,
+ struct gtphub *hub,
+ struct gtp_packet_desc *p,
+ struct gtphub_peer *from_peer)
+{
+ OSMO_ASSERT(p->version == 1);
+
+ struct nr_mapping *nrm;
+ uint32_t tei;
+
+ *to_peer_p = NULL;
+
+ /* If the header's TEI is zero, no PDP context has been established
+ * yet. If nonzero, a mapping should actually already exist for this
+ * TEI, since it must have been announced in a PDP context creation. */
+ tei = get_tei(p);
+
+ if (!tei)
+ return 0;
+
+ /* to_peer has previously announced a TEI, which was stored and
+ * mapped in from_peer's tei_map. */
+ nrm = nr_map_get_inv(&from_peer->tei_map, tei);
+ if (!nrm) {
+ LOGERR("Received unknown TEI %" PRIu32 " from %s\n",
+ tei, osmo_sockaddr_to_str(&from_peer->addr));
+ return -1;
+ }
+
+ struct gtphub_peer *to_peer = nrm->origin;
+ uint32_t unmapped_tei = nrm->orig;
+ set_tei(p, unmapped_tei);
+
+ char buf[256];
+ LOG("Unmapped TEI coming from %p %s: %d -> %d (to %s)\n",
+ from_peer, osmo_sockaddr_to_str(&from_peer->addr), tei,
+ unmapped_tei, osmo_sockaddr_to_strb(&to_peer->addr, buf,
sizeof(buf)));
+
+ *to_peer_p = to_peer;
+ return 0;
+}
+
+/* In a packet coming from from_peer, find TEI IE with type number ie_type. If
+ * it does not exist yet, create a mapping for the TEI in to_peer's map. A
+ * message coming from to_peer can then be addressed to the (new) mapped TEI,
+ * and will trace back to from_peer and the TEI in this p's IE.
+ *
+ * Also replace the TEI with a mapped TEI in the GTP packet's data buffer. The
+ * buffer can then be sent on to to_peer. */
+static int gtphub_map_tei_ie(struct gtp_packet_desc *p,
+ uint8_t ie_type, int mandatory,
+ struct gtphub_peer *from_peer,
+ struct gtphub_peer *to_peer,
+ unsigned int port_idx)
+{
+ int ie_idx;
+ uint32_t tei;
+ uint32_t mapped_tei;
+
+ OSMO_ASSERT(from_peer);
+ OSMO_ASSERT(to_peer);
+
+ from_peer = from_peer->association[port_idx];
+ to_peer = to_peer->association[port_idx];
+
+ if (!(from_peer && to_peer)) {
+ LOGERR("Missing peer in %s plane /"
+ " missing Create PDP Context Request\n",
+ gtphub_port_idx_names[port_idx]);
+ return -1;
+ }
+
+ ie_idx = gtpie_getie(p->ie, ie_type, 0);
+ if (ie_idx < 0) {
+ if (! mandatory)
+ return 0;
+
+ LOGERR("Create PDP Context Request: Invalid: missing IE %d\n",
ie_type);
+ return -1;
+ }
+ tei = ntoh32(p->ie[ie_idx]->tv4.v);
+ /* When to_peer later sends the mapped tei for this tei, we
+ * want to obtain this tei and from_peer. */
+ struct nr_mapping *nrm;
+ nrm = gtphub_mapping_have(&to_peer->tei_map,
+ from_peer, tei);
+
+ mapped_tei = nrm->repl;
+ p->ie[ie_idx]->tv4.v = hton32(mapped_tei);
+
+ char buf[256];
+ LOG("Storing new %s TEI in peer %p %s's map: (from %s, TEI %d) -> TEI
%d\n",
+ gtphub_port_idx_names[port_idx],
+ to_peer,
+ osmo_sockaddr_to_str(&to_peer->addr),
+ osmo_sockaddr_to_strb(&from_peer->addr, buf, sizeof(buf)),
+ tei, mapped_tei);
+
+ return 0;
+}
+
+/* The responding peer does not know that it is going to be the responding peer
+ * yet, but it must already be resolved and initialized. The GTP packet is
+ * coming from requesting_peer.*/
+static int gtphub_handle_create_pdp_req(struct gtphub *hub,
+ struct gtp_packet_desc *p,
+ struct gtphub_peer *requesting_peer,
+ struct gtphub_peer *responding_peer)
+{
+ /* This is a Create PDP Context Request. Expecting this
+ * to come from the SGSN side. */
+ /* TODO enforce? */
+ int rc;
+
+ rc = gtphub_map_tei_ie(p, GTPIE_TEI_DI, 1,
+ requesting_peer, responding_peer,
+ GTPH_PORT_USER);
+ if (rc < 0)
+ return rc;
+
+ rc = gtphub_map_tei_ie(p, GTPIE_TEI_C, 1,
+ requesting_peer, responding_peer,
+ GTPH_PORT_CTRL);
+ return rc;
+}
+
+/* The GTP packet is coming from responding_peer; "responding peer" in the
+ * sense of the Create PDP Context messages. requesting_peer will have been
+ * figured out from sequence number and/or header TEI. */
+static int gtphub_handle_create_pdp_resp(struct gtphub *hub,
+ struct gtp_packet_desc *p,
+ struct gtphub_peer *responding_peer,
+ struct gtphub_peer *requesting_peer)
+{
+ /* This is a Create PDP Context Response. Expecting this
+ * to come from the GGSN side. */
+ /* TODO enforce? */
+ int rc;
+
+ rc = gtphub_map_tei_ie(p, GTPIE_TEI_DI, 0,
+ responding_peer, requesting_peer,
+ GTPH_PORT_USER);
+ if (rc < 0)
+ return rc;
+
+ rc = gtphub_map_tei_ie(p, GTPIE_TEI_C, 0,
+ responding_peer, requesting_peer,
+ GTPH_PORT_CTRL);
+ return rc;
+}
+
+static int gtphub_map_ie_teis(struct gtphub *hub,
+ struct gtp_packet_desc *p,
+ struct gtphub_peer *from_peer,
+ struct gtphub_peer *to_peer)
+{
+ OSMO_ASSERT(p->version == 1);
+ struct gtp1_header_long *h = &p->data->gtp1l.h;
+ uint8_t type = ntoh8(h->type);
+
+ switch (type) {
+ case GTP_CREATE_PDP_REQ:
+ gtphub_handle_create_pdp_req(hub, p, from_peer, to_peer);
+ break;
+
+ case GTP_CREATE_PDP_RSP:
+ gtphub_handle_create_pdp_resp(hub, p, from_peer, to_peer);
+ break;
+
+ default:
+ break;
+ }
+ return 0;
+}
+
+static void gtphub_replace_addresses(struct gtphub *hub,
+ struct gtp_packet_desc *p,
+ struct gtphub_peer *from,
+ struct gtphub_bind *from_bind,
+ struct gtphub_peer *to,
+ struct gtphub_bind *to_bind)
+{
+ /* TODO */
+}
+
+static int gtphub_write(struct osmo_fd *to,
+ struct osmo_sockaddr *to_addr,
+ uint8_t *buf, size_t buf_len)
+{
+ errno = 0;
+ ssize_t sent = sendto(to->fd, buf, buf_len, 0,
+ (struct sockaddr*)&to_addr->a, to_addr->l);
+
+ if (to_addr) {
+ LOG("to %s\n", osmo_sockaddr_to_str(to_addr));
+ }
+
+ if (sent == -1) {
+ LOGERR("error: %s\n", strerror(errno));
+ return -EINVAL;
+ }
+
+ if (sent != buf_len)
+ LOGERR("sent(%d) != data_len(%d)\n", (int)sent, (int)buf_len);
+ else
+ LOG("Sent %d\n%s\n", (int)sent, osmo_hexdump(buf, sent));
+
+ return 0;
+}
+
+int gtphub_from_ggsns_handle_buf(struct gtphub *hub,
+ unsigned int port_idx,
+ const struct osmo_sockaddr *from_addr,
+ uint8_t *buf,
+ size_t received,
+ struct osmo_fd **to_ofd,
+ struct osmo_sockaddr **to_addr);
+
+static struct gtphub_peer *gtphub_peer_find(const struct gtphub_bind *bind,
+ const struct osmo_sockaddr *addr);
+
+static int from_ggsns_read_cb(struct osmo_fd *from_ggsns_ofd, unsigned int
what)
+{
+ unsigned int port_idx = from_ggsns_ofd->priv_nr;
+ OSMO_ASSERT(port_idx < GTPH_PORT_N);
+ LOG("\n\n=== reading from GGSN (%s)\n",
gtphub_port_idx_names[port_idx]);
+ if (!(what & BSC_FD_READ))
+ return 0;
+
+ struct gtphub *hub = from_ggsns_ofd->data;
+
+ static uint8_t buf[4096];
+ struct osmo_sockaddr from_addr;
+ struct osmo_sockaddr *to_addr;
+ struct osmo_fd *to_ofd;
+ size_t len;
+
+ len = gtphub_read(from_ggsns_ofd, &from_addr, buf, sizeof(buf));
+ if (len < 1)
+ return 0;
+
+ len = gtphub_from_ggsns_handle_buf(hub, port_idx, &from_addr, buf, len,
+ &to_ofd, &to_addr);
+ if (len < 1)
+ return 0;
+
+ return gtphub_write(to_ofd, to_addr, buf, len);
+}
+
+static int gtphub_unmap(struct gtphub *hub,
+ struct gtp_packet_desc *p,
+ struct gtphub_peer *from,
+ struct gtphub_peer *to_proxy,
+ struct gtphub_peer **final_unmapped,
+ struct gtphub_peer **unmapped_from_seq,
+ struct gtphub_peer **unmapped_from_tei)
+{
+ /* Always (try to) unmap sequence and TEI numbers, which need to be
+ * replaced in the packet. Either way, give precedence to the proxy, if
+ * configured. */
+
+ struct gtphub_peer *from_seq = NULL;
+ struct gtphub_peer *from_tei = NULL;
+ struct gtphub_peer *unmapped = NULL;
+
+ if (unmapped_from_seq)
+ *unmapped_from_seq = from_seq;
+ if (unmapped_from_tei)
+ *unmapped_from_tei = from_tei;
+ if (final_unmapped)
+ *final_unmapped = unmapped;
+
+ from_seq = gtphub_unmap_seq(p, from);
+
+ if (gtphub_unmap_header_tei(&from_tei, hub, p, from) < 0)
+ return -1;
+
+ if (from_seq && from_tei && (from_seq != from_tei)) {
+ char b0[256];
+ char b1[256];
+ LOGERR("Seq unmap and TEI unmap yield two different peers.
Using seq unmap."
+ "(from %s %s: seq %d yields %s, tei %u yields %s)\n",
+ gtphub_port_idx_names[p->port_idx],
+ osmo_sockaddr_to_str(&from->addr),
+ (int)get_seq(p),
+ osmo_sockaddr_to_strb(&from_seq->addr, b0, sizeof(b0)),
+ (int)get_tei(p),
+ osmo_sockaddr_to_strb(&from_tei->addr, b1, sizeof(b1))
+ );
+ }
+ unmapped = (from_seq? from_seq : from_tei);
+
+ if (unmapped && to_proxy && (unmapped != to_proxy)) {
+ char buf[256];
+ LOGERR("Unmap yields a different peer than the configured
proxy. Using proxy."
+ " unmapped: %s proxy: %s\n",
+ osmo_sockaddr_to_str(&unmapped->addr),
+ osmo_sockaddr_to_strb(&to_proxy->addr, buf, sizeof(buf))
+ );
+ }
+ unmapped = (to_proxy? to_proxy : unmapped);
+
+ if (!unmapped) {
+ /* Return no error, but returned pointers are all NULL. */
+ return 0;
+ }
+
+ LOG("from seq %p; from tei %p; unmapped => %p\n",
+ from_seq, from_tei, unmapped);
+
+ if (unmapped_from_seq)
+ *unmapped_from_seq = from_seq;
+ if (unmapped_from_tei)
+ *unmapped_from_tei = from_tei;
+ if (final_unmapped)
+ *final_unmapped = unmapped;
+ return 0;
+}
+
+/* Parse buffer as GTP packet, replace elements in-place and return the ofd and
+ * address to forward to. Return the number of bytes to forward, 0 or less on
+ * failure. Return the fd and address to forward to in to_ofd and to_addr. */
+int gtphub_from_ggsns_handle_buf(struct gtphub *hub,
+ unsigned int port_idx,
+ const struct osmo_sockaddr *from_addr,
+ uint8_t *buf,
+ size_t received,
+ struct osmo_fd **to_ofd,
+ struct osmo_sockaddr **to_addr)
+{
+ LOG("<- rx from GGSN %s\n", osmo_sockaddr_to_str(from_addr));
+
+ static struct gtp_packet_desc p;
+ gtp_decode(buf, received, port_idx, &p);
+
+ if (p.rc <= 0)
+ return -1;
+
+ /* If a GGSN proxy is configured, check that it's indeed that proxy
+ * talking to us. */
+ struct gtphub_peer *ggsn = hub->ggsn_proxy[port_idx];
+ if (ggsn && (osmo_sockaddr_cmp(&ggsn->addr, from_addr) != 0)) {
+ char buf[256];
+ LOGERR("Rejecting: GGSN proxy configured, but GTP packet"
+ " received on GGSN bind is from another sender:"
+ " proxy: %s sender: %s\n",
+ osmo_sockaddr_to_str(&ggsn->addr),
+ osmo_sockaddr_to_strb(from_addr, buf, sizeof(buf)));
+ return -1;
+ }
+
+ if (!ggsn) {
+ /* If any PDP context has been created, we already have an
+ * entry for this GGSN. If we don't have an entry, the GGSN has
+ * nothing to tell us about. */
+ ggsn = gtphub_peer_find(&hub->to_ggsns[port_idx], from_addr);
+ LOG("Found peer %p for %s\n", ggsn,
osmo_sockaddr_to_str(from_addr));
+ }
+
+ if (!ggsn) {
+ LOGERR("no ggsn\n");
+ return -1;
+ }
+
+ struct gtphub_peer *sgsn_from_seq;
+ struct gtphub_peer *sgsn;
+ if (gtphub_unmap(hub, &p, ggsn,
+ hub->sgsn_proxy[port_idx],
+ &sgsn, &sgsn_from_seq, NULL)
+ != 0) {
+ return -1;
+ }
+
+ if (!sgsn) {
+ LOGERR("No SGSN to send to. Dropping packet.\n");
+ return -1;
+ }
+
+ gtphub_check_restart_counter(hub, &p, ggsn);
+ gtphub_map_restart_counter(hub, &p, ggsn, sgsn);
+ gtphub_replace_addresses(hub, &p,
+ ggsn, &hub->to_ggsns[port_idx],
+ sgsn, &hub->to_sgsns[port_idx]);
+
+ /* If the GGSN is replying to an SGSN request, the sequence nr has
+ * already been unmapped above (sgsn_from_seq != NULL), and we need not
+ * create a new mapping. */
+ if (!sgsn_from_seq)
+ gtphub_map_seq(&p, ggsn, sgsn);
+
+ /* If IEs announce new TEIs, map those. */
+ if (gtphub_map_ie_teis(hub, &p, ggsn, sgsn) < 0) {
+ LOGERR("Dropping invalid packet\n");
+ return -1;
+ }
+
+ *to_ofd = &hub->to_sgsns[port_idx].ofd;
+ *to_addr = &sgsn->addr;
+
+ return received;
+}
+
+int gtphub_from_sgsns_handle_buf(struct gtphub *hub,
+ unsigned int port_idx,
+ const struct osmo_sockaddr *from_addr,
+ uint8_t *buf,
+ size_t received,
+ struct osmo_fd **to_ofd,
+ struct osmo_sockaddr **to_addr);
+
+static int from_sgsns_read_cb(struct osmo_fd *from_sgsns_ofd, unsigned int
what)
+{
+ unsigned int port_idx = from_sgsns_ofd->priv_nr;
+ OSMO_ASSERT(port_idx < GTPH_PORT_N);
+ LOG("\n\n=== reading from SGSN (%s)\n",
gtphub_port_idx_names[port_idx]);
+
+ if (!(what & BSC_FD_READ))
+ return 0;
+
+ struct gtphub *hub = from_sgsns_ofd->data;
+
+ static uint8_t buf[4096];
+ struct osmo_sockaddr from_addr;
+ struct osmo_sockaddr *to_addr;
+ struct osmo_fd *to_ofd;
+ size_t len;
+
+ len = gtphub_read(from_sgsns_ofd, &from_addr, buf, sizeof(buf));
+ if (len < 1)
+ return 0;
+
+ len = gtphub_from_sgsns_handle_buf(hub, port_idx, &from_addr, buf, len,
+ &to_ofd, &to_addr);
+ if (len < 1)
+ return 0;
+
+ return gtphub_write(to_ofd, to_addr, buf, len);
+}
+
+/* Parse buffer as GTP packet, replace elements in-place and return the ofd and
+ * address to forward to. Return the number of bytes to forward, 0 or less on
+ * failure. Return the fd and address to forward to in to_ofd and to_addr. */
+int gtphub_from_sgsns_handle_buf(struct gtphub *hub,
+ unsigned int port_idx,
+ const struct osmo_sockaddr *from_addr,
+ uint8_t *buf,
+ size_t received,
+ struct osmo_fd **to_ofd,
+ struct osmo_sockaddr **to_addr)
+{
+ LOG("-> rx from SGSN %s\n", osmo_sockaddr_to_str(from_addr));
+
+ static struct gtp_packet_desc p;
+ gtp_decode(buf, received, port_idx, &p);
+
+ if (p.rc <= 0)
+ return -1;
+
+ /* If an SGSN proxy is configured, check that it's indeed that proxy
+ * talking to us. */
+ struct gtphub_peer *sgsn = hub->sgsn_proxy[port_idx];
+ if (sgsn && (osmo_sockaddr_cmp(&sgsn->addr, from_addr) != 0)) {
+ char buf[256];
+ LOGERR("Rejecting: SGSN proxy configured, but GTP packet"
+ " received on SGSN bind is from another sender: "
+ "proxy: %s sender: %s\n",
+ osmo_sockaddr_to_str(from_addr),
+ osmo_sockaddr_to_strb(&sgsn->addr, buf, sizeof(buf)));
+ return -1;
+ }
+
+ if (!sgsn) {
+ /* TODO this is a worthless hack to test things. Instead:
+ sgsn = gtphub_sgsn_get(hub, ...); */
+ sgsn = llist_first(&hub->to_sgsns[port_idx].peers,
+ struct gtphub_peer, entry);
+ if (!sgsn) {
+ sgsn = gtphub_peer_new_from_sockaddr(hub,
+ hub->to_sgsns,
+ port_idx,
+ from_addr,
+ -1);
+ if (!sgsn) {
+ LOG("Packet dropped by preliminary debug
code.\n");
+ return -1;
+ }
+ LOG("Created peer %p\n", sgsn);
+ }
+
+ if (osmo_sockaddr_cmp(&sgsn->addr, from_addr) != 0) {
+ char buf[256];
+ LOG("SGSN changed its address from %s to %s\n",
+ osmo_sockaddr_to_str(&sgsn->addr),
+ osmo_sockaddr_to_strb(from_addr, buf, sizeof(buf)));
+ memcpy(&sgsn->addr, from_addr, sizeof(sgsn->addr));
+ }
+ LOG("Peer %p = %s\n", sgsn, osmo_sockaddr_to_str(&sgsn->addr));
+ }
+
+ struct gtphub_peer *ggsn_from_seq;
+ struct gtphub_peer *ggsn;
+ if (gtphub_unmap(hub, &p, sgsn,
+ hub->ggsn_proxy[port_idx],
+ &ggsn, &ggsn_from_seq, NULL)
+ != 0) {
+ return -1;
+ }
+
+ /* See what our GGSN guess would be from the packet data per se. */
+ /* TODO maybe not do this always? */
+ struct gtphub_peer *ggsn_from_packet;
+ ggsn_from_packet = gtphub_resolve_ggsn(hub, &p, port_idx);
+
+ if (ggsn_from_packet && ggsn
+ && (ggsn_from_packet != ggsn)) {
+ char buf[256];
+ LOGERR("GGSN implied from packet does not match unmapped"
+ " GGSN, using unmapped GGSN:"
+ " from packet: %s unmapped: %s\n",
+ osmo_sockaddr_to_str(&ggsn_from_packet->addr),
+ osmo_sockaddr_to_strb(&ggsn_from_packet->addr,
+ buf, sizeof(buf)));
+ /* TODO return -1; ? */
+ }
+
+ if (!ggsn)
+ ggsn = ggsn_from_packet;
+
+ if (!ggsn) {
+ LOGERR("No GGSN to send to. Dropping packet.\n");
+ return -1;
+ }
+
+ gtphub_check_restart_counter(hub, &p, sgsn);
+ gtphub_map_restart_counter(hub, &p, sgsn, ggsn);
+ gtphub_replace_addresses(hub, &p,
+ sgsn, &hub->to_sgsns[port_idx],
+ ggsn, &hub->to_ggsns[port_idx]);
+
+ /* If the SGSN is replying to a GGSN request, the sequence nr has
+ * already been unmapped above (unmap_ggsn != NULL), and we need not
+ * create a new outgoing sequence map. */
+ if (!ggsn_from_seq)
+ gtphub_map_seq(&p, sgsn, ggsn);
+
+ /* If IEs announce new TEIs, map those. */
+ if (gtphub_map_ie_teis(hub, &p, sgsn, ggsn) < 0) {
+ LOGERR("Dropping invalid packet\n");
+ return -1;
+ }
+
+ *to_ofd = &hub->to_ggsns[port_idx].ofd;
+ *to_addr = &ggsn->addr;
+
+ return received;
+}
+
+static void gtphub_gc_bind(struct gtphub *hub, struct gtphub_bind *b)
+{
+ struct gtphub_peer *p, *n;
+ llist_for_each_entry_safe(p, n, &b->peers, entry) {
+
+ if ((!p->ref_count)
+ && nr_map_empty(&p->seq_map)) {
+
+ LOG("expired: peer %s\n",
+ osmo_sockaddr_to_str(&p->addr));
+ gtphub_peer_del(p);
+ }
+ }
+}
+
+void gtphub_gc(struct gtphub *hub, time_t now)
+{
+ int expired;
+ expired = nr_map_expiry_tick(&hub->expire_seq_maps, now);
+ expired += nr_map_expiry_tick(&hub->expire_tei_maps, now);
+
+ /* ... */
+
+ if (expired) {
+ int i;
+ for (i = 0; i < GTPH_PORT_N; i++) {
+ gtphub_gc_bind(hub, &hub->to_sgsns[i]);
+ gtphub_gc_bind(hub, &hub->to_ggsns[i]);
+ }
+ }
+}
+
+static void gtphub_gc_cb(void *data)
+{
+ struct gtphub *hub = data;
+ gtphub_gc(hub, gtphub_now());
+ osmo_timer_schedule(&hub->gc_timer, GTPH_GC_TICK_SECONDS, 0);
+}
+
+static void gtphub_gc_start(struct gtphub *hub)
+{
+ hub->gc_timer.cb = gtphub_gc_cb;
+ hub->gc_timer.data = hub;
+
+ osmo_timer_schedule(&hub->gc_timer, GTPH_GC_TICK_SECONDS, 0);
+}
+
+/* called by unit tests */
+void gtphub_init(struct gtphub *hub)
+{
+ gtphub_zero(hub);
+
+ nr_map_expiry_init(&hub->expire_seq_maps, GTPH_SEQ_MAPPING_EXPIRY_SECS);
+ nr_map_expiry_init(&hub->expire_tei_maps,
GTPH_TEI_MAPPING_EXPIRY_MINUTES * 60);
+
+ int port_idx;
+ for (port_idx = 0; port_idx < GTPH_PORT_N; port_idx++) {
+ gtphub_gtp_bind_init(&hub->to_ggsns[port_idx]);
+ gtphub_gtp_bind_init(&hub->to_sgsns[port_idx]);
+ }
+}
+
+int gtphub_start(struct gtphub *hub, struct gtphub_cfg *cfg)
+{
+ int rc;
+
+ gtphub_init(hub);
+
+ int port_idx;
+ for (port_idx = 0; port_idx < GTPH_PORT_N; port_idx++) {
+ rc = gtphub_gtp_bind_start(&hub->to_ggsns[port_idx],
+ &cfg->to_ggsns[port_idx],
+ from_ggsns_read_cb, hub, port_idx);
+ if (rc) {
+ LOGERR("Failed to bind for GGSNs (%s)\n",
+ gtphub_port_idx_names[port_idx]);
+ return rc;
+ }
+
+ rc = gtphub_gtp_bind_start(&hub->to_sgsns[port_idx],
+ &cfg->to_sgsns[port_idx],
+ from_sgsns_read_cb, hub, port_idx);
+ if (rc) {
+ LOGERR("Failed to bind for SGSNs (%s)\n",
+ gtphub_port_idx_names[port_idx]);
+ return rc;
+ }
+ }
+
+ /* SGSN proxy. Trigger only on the control port address. */
+ if (cfg->sgsn_proxy[GTPH_PORT_CTRL].addr_str) {
+ struct gtphub_cfg_addr *addr_c =
&cfg->sgsn_proxy[GTPH_PORT_CTRL];
+ struct gtphub_cfg_addr *addr_u =
&cfg->sgsn_proxy[GTPH_PORT_USER];
+
+ struct gtphub_peer *sgsn_c;
+ struct gtphub_peer *sgsn_u;
+ sgsn_c = gtphub_peer_new(hub, hub->to_sgsns, GTPH_PORT_CTRL,
+ addr_c->addr_str, addr_c->port,
+ addr_u->addr_str, addr_u->port);
+ sgsn_u = sgsn_c->association[GTPH_PORT_USER];
+
+ hub->sgsn_proxy[GTPH_PORT_CTRL] = sgsn_c;
+ hub->sgsn_proxy[GTPH_PORT_USER] = sgsn_u;
+
+ /* This is *the* proxy SGSN. Make sure it is never expired. */
+ gtphub_peer_ref_count_inc(sgsn_c);
+ gtphub_peer_ref_count_inc(sgsn_u);
+
+ LOG("Using SGSN %s proxy %s port %d\n",
+ gtphub_port_idx_names[GTPH_PORT_CTRL],
+ addr_c->addr_str,
+ (int)addr_c->port);
+ LOG("Using SGSN %s proxy %s port %d\n",
+ gtphub_port_idx_names[GTPH_PORT_USER],
+ addr_u->addr_str,
+ (int)addr_u->port);
+ }
+
+ /* GGSN proxy. Trigger only on the control port address. */
+ if (cfg->ggsn_proxy[GTPH_PORT_CTRL].addr_str) {
+ struct gtphub_cfg_addr *addr_c =
&cfg->ggsn_proxy[GTPH_PORT_CTRL];
+ struct gtphub_cfg_addr *addr_u =
&cfg->ggsn_proxy[GTPH_PORT_USER];
+
+ struct gtphub_peer *ggsn_c;
+ struct gtphub_peer *ggsn_u;
+ ggsn_c = gtphub_peer_new(hub, hub->to_ggsns, GTPH_PORT_CTRL,
+ addr_c->addr_str, addr_c->port,
+ addr_u->addr_str, addr_u->port);
+ ggsn_u = ggsn_c->association[GTPH_PORT_USER];
+
+ hub->ggsn_proxy[GTPH_PORT_CTRL] = ggsn_c;
+ hub->ggsn_proxy[GTPH_PORT_USER] = ggsn_u;
+
+ /* This is *the* proxy GGSN. Make sure it is never expired. */
+ gtphub_peer_ref_count_inc(ggsn_c);
+ gtphub_peer_ref_count_inc(ggsn_u);
+
+ LOG("Using GGSN %s proxy %s port %d\n",
+ gtphub_port_idx_names[GTPH_PORT_CTRL],
+ addr_c->addr_str,
+ (int)addr_c->port);
+ LOG("Using GGSN %s proxy %s port %d\n",
+ gtphub_port_idx_names[GTPH_PORT_USER],
+ addr_u->addr_str,
+ (int)addr_u->port);
+ }
+
+ gtphub_gc_start(hub);
+ return 0;
+}
+
+static struct gtphub_peer *_gtphub_peer_new(struct gtphub *hub,
+ struct gtphub_bind bind[],
+ unsigned int port_idx,
+ const char *addr_str,
+ uint16_t port)
+{
+ struct gtphub_peer *n = talloc_zero(osmo_gtphub_ctx, struct
gtphub_peer);
+
+ nr_map_init(&n->tei_map, &bind[port_idx].tei_pool,
&hub->expire_tei_maps);
+
+ nr_pool_init(&n->seq_pool);
+ nr_map_init(&n->seq_map, &n->seq_pool, &hub->expire_seq_maps);
+
+ /* TODO use something random to pick the initial sequence nr.
+ 0x6d31 produces the ASCII character sequence 'm1', currently used in
+ gtphub_nc_test.sh. */
+ n->seq_pool.last_nr = 0x6d31 - 1;
+
+ llist_add(&n->entry, &bind[port_idx].peers);
+
+ if (!port) {
+ port = (port_idx == GTPH_PORT_USER)? GTP1U_PORT : GTP1C_PORT;
+ }
+
+ LOG("New peer: %s %s %d\n", gtphub_port_idx_names[port_idx], addr_str,
+ (int)port);
+
+ if (osmo_sockaddr_init_udp(&n->addr, addr_str, port) != 0) {
+ LOGERR("Cannot resolve '%s port %d'\n",
+ addr_str, (int)port);
+ talloc_free(n);
+ return NULL;
+ }
+
+ return n;
+}
+
+/* Create two new gtphub_peer instances added to bind[CTRL]->peers and
+ * bind[USER]->peers.
+ * Initialize:
+ * - point association[port_idx]es to the respective instances,
+ * - resolve the provided addresses,
+ * - set default port numbers for the respective planes, if a given port is 0.
+ * addr_str and port define the peer for the GTP plane indicated by port_idx.
+ * other_addr_str and other_port are used to initialize the peer on the
+ * respective other plane (if port_idx is GTPH_PORT_CTRL, other_addr_str and
+ * other_port are for the User plane). other_addr_str may be NULL, in which
+ * case addr_str is used for both planes. One or both ports may be 0, in which
+ * case the default port for that plane is used. Return a pointer to the new
+ * instance in the <port_idx> plane, or NULL on error. */
+static struct gtphub_peer *gtphub_peer_new(struct gtphub *hub,
+ struct gtphub_bind bind[],
+ unsigned int port_idx,
+ const char *addr_str,
+ uint16_t port,
+ const char *other_addr_str,
+ uint16_t other_port)
+{
+ if (!other_addr_str)
+ other_addr_str = addr_str;
+
+ const char *addr_str_c;
+ const char *addr_str_u;
+ uint16_t port_c;
+ uint16_t port_u;
+ if (port_idx == GTPH_PORT_CTRL) {
+ addr_str_c = addr_str;
+ addr_str_u = other_addr_str;
+ port_c = port;
+ port_u = other_port;
+ }
+ else {
+ OSMO_ASSERT(port_idx == GTPH_PORT_USER);
+ addr_str_u = addr_str;
+ addr_str_c = other_addr_str;
+ port_u = port;
+ port_c = other_port;
+ }
+
+ struct gtphub_peer *c = _gtphub_peer_new(hub, bind, GTPH_PORT_CTRL,
+ addr_str_c, port_c);
+ struct gtphub_peer *u = _gtphub_peer_new(hub, bind, GTPH_PORT_USER,
+ addr_str_u, port_u);
+
+ c->association[GTPH_PORT_CTRL] = u->association[GTPH_PORT_CTRL] = c;
+ c->association[GTPH_PORT_USER] = u->association[GTPH_PORT_USER] = u;
+
+ return c->association[port_idx];
+}
+
+/* port_override: -1: use port from addr; 0: use plane's default port; >0: use
+ * this number as port. */
+static struct gtphub_peer *gtphub_peer_new_from_sockaddr(struct gtphub *hub,
+ struct gtphub_bind
bind[],
+ unsigned int port_idx,
+ const struct
osmo_sockaddr *addr,
+ int port_override)
+{
+ char addr_str[256];
+ char port_str[6];
+
+ if (osmo_sockaddr_to_strs(addr_str, sizeof(addr_str),
+ port_str, sizeof(port_str),
+ addr,
+ (NI_NUMERICHOST | NI_NUMERICSERV))
+ != 0) {
+ return NULL;
+ }
+
+ uint16_t port = port_override < 0? atoi(port_str) : port_override;
+
+ return gtphub_peer_new(hub, bind, port_idx, addr_str, port, NULL, 0);
+}
+
+static void gtphub_peer_del(struct gtphub_peer *peer)
+{
+ nr_map_clear(&peer->seq_map);
+ llist_del(&peer->entry);
+ talloc_free(peer);
+}
+
+static struct gtphub_peer *gtphub_peer_find(const struct gtphub_bind *bind,
+ const struct osmo_sockaddr *addr)
+{
+ struct gtphub_peer *peer;
+ llist_for_each_entry(peer, &bind->peers, entry) {
+ if (osmo_sockaddr_cmp(addr, &peer->addr) == 0)
+ return peer;
+ }
+ return NULL;
+}
+
+static struct gtphub_peer *gtphub_have_ggsn(struct gtphub *hub,
+ struct osmo_sockaddr *addr,
+ unsigned int port_idx)
+{
+ struct gtphub_peer *peer;
+ peer = gtphub_peer_find(&hub->to_ggsns[port_idx], addr);
+ if (peer)
+ return peer;
+
+ /* Not found, create one. */
+ peer = gtphub_peer_new_from_sockaddr(hub, hub->to_ggsns, port_idx,
addr, -1);
+ return peer;
+}
+
+static struct gtphub_peer *gtphub_resolve_ggsn(struct gtphub *hub,
+ struct gtp_packet_desc *p,
+ unsigned int port_idx)
+{
+ int rc;
+
+ struct osmo_sockaddr addr;
+
+ rc = gtphub_resolve_ggsn_addr(hub, &addr, p);
+ if (rc < 0)
+ return NULL;
+
+ return gtphub_have_ggsn(hub, &addr, port_idx);
+}
+
+
+/* TODO move to osmocom/core/socket.c ? */
+/* The caller is required to call freeaddrinfo(*result), iff zero is returned.
*/
+/* use this in osmo_sock_init() to remove dup. */
+static int _osmo_getaddrinfo(struct addrinfo **result,
+ uint16_t family, uint16_t type, uint8_t proto,
+ const char *host, uint16_t port)
+{
+ struct addrinfo hints;
+ char portbuf[16];
+
+ sprintf(portbuf, "%u", port);
+ memset(&hints, '\0', sizeof(struct addrinfo));
+ hints.ai_family = family;
+ if (type == SOCK_RAW) {
+ /* Workaround for glibc, that returns EAI_SERVICE (-8) if
+ * SOCK_RAW and IPPROTO_GRE is used.
+ */
+ hints.ai_socktype = SOCK_DGRAM;
+ hints.ai_protocol = IPPROTO_UDP;
+ } else {
+ hints.ai_socktype = type;
+ hints.ai_protocol = proto;
+ }
+
+ return getaddrinfo(host, portbuf, &hints, result);
+}
+
+/* TODO move to osmocom/core/socket.c ? */
+int osmo_sockaddr_init(struct osmo_sockaddr *addr,
+ uint16_t family, uint16_t type, uint8_t proto,
+ const char *host, uint16_t port)
+{
+ struct addrinfo *res;
+ int rc;
+ rc = _osmo_getaddrinfo(&res, family, type, proto, host, port);
+
+ if (rc != 0) {
+ LOGERR("getaddrinfo returned error %d\n", (int)rc);
+ return -EINVAL;
+ }
+
+ OSMO_ASSERT(res->ai_addrlen <= sizeof(addr->a));
+ memcpy(&addr->a, res->ai_addr, res->ai_addrlen);
+ addr->l = res->ai_addrlen;
+ freeaddrinfo(res);
+
+ return 0;
+}
+
+int osmo_sockaddr_to_strs(char *addr_str, size_t addr_str_len,
+ char *port_str, size_t port_str_len,
+ const struct osmo_sockaddr *addr,
+ int flags)
+{
+ int rc;
+
+ if ((addr->l < 1) || (addr->l > sizeof(addr->a))) {
+ LOGP(DGTPHUB, LOGL_ERROR, "Invalid address size: %d\n", addr->l);
+ return -1;
+ }
+
+ if (addr->l > sizeof(addr->a)) {
+ LOGP(DGTPHUB, LOGL_ERROR, "Invalid address: too long: %d\n",
addr->l);
+ return -1;
+ }
+
+ rc = getnameinfo((struct sockaddr*)&addr->a, addr->l,
+ addr_str, addr_str_len,
+ port_str, port_str_len,
+ flags);
+
+ if (rc)
+ LOGP(DGTPHUB, LOGL_ERROR, "Invalid address: %s: %s\n",
gai_strerror(rc),
+ osmo_hexdump((uint8_t*)&addr->a, addr->l));
+
+ return rc;
+}
+
+const char *osmo_sockaddr_to_strb(const struct osmo_sockaddr *addr,
+ char *buf, size_t buf_len)
+{
+ const int portbuf_len = 6;
+ OSMO_ASSERT(buf_len > portbuf_len);
+ char *portbuf = buf + buf_len - portbuf_len;
+ buf_len -= portbuf_len;
+ if (osmo_sockaddr_to_strs(buf, buf_len,
+ portbuf, portbuf_len,
+ addr,
+ NI_NUMERICHOST | NI_NUMERICSERV))
+ return NULL;
+
+ char *pos = buf + strnlen(buf, buf_len-1);
+ size_t len = buf_len - (pos - buf);
+
+ snprintf(pos, len, " port %s", portbuf);
+ buf[buf_len-1] = '\0';
+
+ return buf;
+}
+
+const char *osmo_sockaddr_to_str(const struct osmo_sockaddr *addr)
+{
+ static char buf[256];
+ const char *result = osmo_sockaddr_to_strb(addr, buf, sizeof(buf));
+ if (! result)
+ return "(invalid)";
+ return result;
+}
+
+int osmo_sockaddr_cmp(const struct osmo_sockaddr *a, const struct
osmo_sockaddr *b)
+{
+ if (a->l != b->l) {
+ /* Lengths are not the same, but determine the order. Will
+ * anyone ever sort a list by osmo_sockaddr though...? */
+ int cmp = memcmp(&a->a, &b->a, (a->l < b->l)? a->l : b->l);
+ if (cmp == 0) {
+ if (a->l < b->l)
+ return -1;
+ else
+ return 1;
+ }
+ return cmp;
+ }
+ return memcmp(&a->a, &b->a, a->l);
+}
+
+void osmo_sockaddr_copy(struct osmo_sockaddr *dst, const struct osmo_sockaddr
*src)
+{
+ OSMO_ASSERT(src->l <= sizeof(dst->a));
+ memcpy(&dst->a, &src->a, src->l);
+ dst->l = src->l;
+}
diff --git a/openbsc/src/gprs/gtphub_main.c b/openbsc/src/gprs/gtphub_main.c
new file mode 100644
index 0000000..84c7969
--- /dev/null
+++ b/openbsc/src/gprs/gtphub_main.c
@@ -0,0 +1,283 @@
+/* GTP Hub main program */
+
+/* (C) 2015 by sysmocom s.f.m.c. GmbH <[email protected]>
+ * All Rights Reserved
+ *
+ * Author: Neels Hofmeyr
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <unistd.h>
+#include <signal.h>
+#include <string.h>
+#include <errno.h>
+
+#define _GNU_SOURCE
+#include <getopt.h>
+
+#include <osmocom/core/signal.h>
+#include <osmocom/core/application.h>
+#include <osmocom/core/logging.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/core/rate_ctr.h>
+
+#include <osmocom/vty/logging.h>
+#include <osmocom/vty/telnet_interface.h>
+
+#include <openbsc/debug.h>
+#include <openbsc/gtphub.h>
+#include <openbsc/vty.h>
+
+#include "../../bscconfig.h"
+
+#define LOGERR(fmt, args...) \
+ LOGP(DGTPHUB, LOGL_ERROR, fmt, ##args)
+
+#define LOG(fmt, args...) \
+ LOGP(DGTPHUB, LOGL_NOTICE, fmt, ##args)
+
+#ifndef OSMO_VTY_PORT_GTPHUB
+/* should come from libosmocore */
+#define OSMO_VTY_PORT_GTPHUB 4253
+#endif
+
+extern void *osmo_gtphub_ctx;
+
+
+const char *gtphub_copyright =
+ "Copyright (C) 2015 sysmocom s.f.m.c GmbH <[email protected]>\r\n"
+ "License AGPLv3+: GNU AGPL version 2 or later
<http://gnu.org/licenses/agpl-3.0.html>\r\n"
+ "This is free software: you are free to change and redistribute it.\r\n"
+ "There is NO WARRANTY, to the extent permitted by law.\r\n";
+
+static struct log_info_cat gtphub_categories[] = {
+ [DGTPHUB] = {
+ .name = "DGTPHUB",
+ .description = "GTP Hub",
+ .color = "\033[1;33m",
+ .enabled = 1, .loglevel = LOGL_NOTICE,
+ },
+};
+
+int gtphub_log_filter_fn(const struct log_context *ctx,
+ struct log_target *tar)
+{
+ return 0;
+}
+
+static const struct log_info gtphub_log_info = {
+ .filter_fn = gtphub_log_filter_fn,
+ .cat = gtphub_categories,
+ .num_cat = ARRAY_SIZE(gtphub_categories),
+};
+
+void log_cfg(struct gtphub_cfg *cfg)
+{
+ struct gtphub_cfg_addr *a;
+ a = &cfg->to_sgsns[GTPH_PORT_CTRL].bind;
+ LOG("to-SGSNs bind, Control: %s port %d\n",
+ a->addr_str, a->port);
+ a = &cfg->to_sgsns[GTPH_PORT_USER].bind;
+ LOG("to-SGSNs bind, User: %s port %d\n",
+ a->addr_str, a->port);
+ a = &cfg->to_ggsns[GTPH_PORT_CTRL].bind;
+ LOG("to-GGSNs bind, Control: %s port %d\n",
+ a->addr_str, a->port);
+ a = &cfg->to_ggsns[GTPH_PORT_USER].bind;
+ LOG("to-GGSNs bind, User: %s port %d\n",
+ a->addr_str, a->port);
+}
+
+static void signal_handler(int signal)
+{
+ fprintf(stdout, "signal %u received\n", signal);
+
+ switch (signal) {
+ case SIGINT:
+ osmo_signal_dispatch(SS_L_GLOBAL, S_L_GLOBAL_SHUTDOWN, NULL);
+ sleep(1);
+ exit(0);
+ break;
+ case SIGABRT:
+ /* in case of abort, we want to obtain a talloc report
+ * and then return to the caller, who will abort the process */
+ case SIGUSR1:
+ case SIGUSR2:
+ talloc_report_full(osmo_gtphub_ctx, stderr);
+ break;
+ default:
+ break;
+ }
+}
+
+extern int bsc_vty_go_parent(struct vty *vty);
+
+static struct vty_app_info vty_info = {
+ .name = "OsmoGTPhub",
+ .version = PACKAGE_VERSION,
+ .go_parent_cb = bsc_vty_go_parent,
+ .is_config_node = bsc_vty_is_config_node,
+};
+
+struct cmdline_cfg {
+ const char *config_file;
+ int daemonize;
+};
+
+static void print_help(struct cmdline_cfg *ccfg)
+{
+ printf("gtphub commandline options\n");
+ printf(" -h --help This text.\n");
+ printf(" -D --daemonize Fork the process into a background
daemon.\n");
+ printf(" -d,--debug <cat> Enable Debugging for this category.\n");
+ printf(" Pass '-d list' to get a category
listing.\n");
+ printf(" -s --disable-color");
+ printf(" -c --config-file The config file to use [%s].\n",
ccfg->config_file);
+ printf(" -e,--log-level <nr> Set a global log level.\n");
+}
+
+static void list_categories(void)
+{
+ printf("Avaliable debug categories:\n");
+ int i;
+ for (i = 0; i < gtphub_log_info.num_cat; ++i) {
+ if (!gtphub_log_info.cat[i].name)
+ continue;
+
+ printf("%s\n", gtphub_log_info.cat[i].name);
+ }
+}
+
+static void handle_options(struct cmdline_cfg *ccfg, int argc, char **argv)
+{
+ while (1) {
+ int option_index = 0, c;
+ static struct option long_options[] = {
+ {"help", 0, 0, 'h'},
+ {"debug", 1, 0, 'd'},
+ {"daemonize", 0, 0, 'D'},
+ {"config-file", 1, 0, 'c'},
+ {"disable-color", 0, 0, 's'},
+ {"timestamp", 0, 0, 'T'},
+ {"log-level", 1, 0, 'e'},
+ {NULL, 0, 0, 0}
+ };
+
+ c = getopt_long(argc, argv, "hd:Dc:sTe:",
+ long_options, &option_index);
+ if (c == -1)
+ break;
+
+ switch (c) {
+ case 'h':
+ //print_usage();
+ print_help(ccfg);
+ exit(0);
+ case 's':
+ log_set_use_color(osmo_stderr_target, 0);
+ break;
+ case 'd':
+ if (strcmp("list", optarg) == 0) {
+ list_categories();
+ exit(0);
+ }
+ else
+ log_parse_category_mask(osmo_stderr_target,
optarg);
+ break;
+ case 'D':
+ ccfg->daemonize = 1;
+ break;
+ case 'c':
+ ccfg->config_file = optarg;
+ break;
+ case 'T':
+ log_set_print_timestamp(osmo_stderr_target, 1);
+ break;
+ case 'e':
+ log_set_log_level(osmo_stderr_target, atoi(optarg));
+ break;
+ default:
+ /* ignore */
+ break;
+ }
+ }
+}
+
+int main(int argc, char **argv)
+{
+ int rc;
+
+ osmo_gtphub_ctx = talloc_named_const(NULL, 0, "osmo_gtphub");
+
+ signal(SIGINT, &signal_handler);
+ signal(SIGABRT, &signal_handler);
+ signal(SIGUSR1, &signal_handler);
+ signal(SIGUSR2, &signal_handler);
+ osmo_init_ignore_signals();
+
+ osmo_init_logging(>phub_log_info);
+
+ vty_info.copyright = gtphub_copyright;
+ vty_init(&vty_info);
+ logging_vty_add_cmds(>phub_log_info);
+ gtphub_vty_init();
+
+ rate_ctr_init(osmo_gtphub_ctx);
+ rc = telnet_init(osmo_gtphub_ctx, 0, OSMO_VTY_PORT_GTPHUB);
+ if (rc < 0)
+ exit(1);
+
+ struct cmdline_cfg _ccfg;
+ struct cmdline_cfg *ccfg = &_ccfg;
+ memset(ccfg, '\0', sizeof(*ccfg));
+ ccfg->config_file = "./gtphub.conf";
+
+ struct gtphub_cfg _cfg;
+ struct gtphub_cfg *cfg = &_cfg;
+ memset(cfg, '\0', sizeof(*cfg));
+
+ struct gtphub _hub;
+ struct gtphub *hub = &_hub;
+
+ handle_options(ccfg, argc, argv);
+
+ rc = gtphub_cfg_read(cfg, ccfg->config_file);
+ if (rc < 0) {
+ LOGP(DGTPHUB, LOGL_FATAL, "Cannot parse config file '%s'\n",
ccfg->config_file);
+ exit(2);
+ }
+
+ if (gtphub_start(hub, cfg) != 0)
+ return -1;
+
+ log_cfg(cfg);
+
+ if (ccfg->daemonize) {
+ rc = osmo_daemonize();
+ if (rc < 0) {
+ LOGERR("Error during daemonize");
+ exit(1);
+ }
+ }
+
+ while (1) {
+ rc = osmo_select_main(0);
+ if (rc < 0)
+ exit(3);
+ }
+
+ /* not reached */
+ exit(0);
+}
diff --git a/openbsc/src/gprs/gtphub_sep.c b/openbsc/src/gprs/gtphub_sep.c
new file mode 100644
index 0000000..bb31834
--- /dev/null
+++ b/openbsc/src/gprs/gtphub_sep.c
@@ -0,0 +1,26 @@
+/* This file is kept separate so that these functions can be wrapped for
+ * gtphub_test.c. When a function and its callers are in the same compilational
+ * unit, the wrappability may be optimized away. */
+#include <string.h>
+
+#include <openbsc/gtphub.h>
+#include <osmocom/core/utils.h>
+
+#define __llist_first(head) (((head)->next == (head)) ? NULL : (head)->next)
+#define llist_first(head, type, entry) llist_entry(__llist_first(head), type,
entry)
+
+int gtphub_resolve_ggsn_addr(struct gtphub *hub,
+ struct osmo_sockaddr *result,
+ struct gtp_packet_desc *p)
+{
+ /* TODO This is just hardcodedly returning the first known address.
+ * Should resolve from actual subscriber data. */
+ struct gtphub_peer *ggsn =
llist_first(&hub->to_ggsns[GTPH_PORT_CTRL].peers,
+ struct gtphub_peer, entry);
+ if (!ggsn)
+ return -1;
+
+ memcpy(result, &ggsn->addr, sizeof(struct osmo_sockaddr));
+ return 0;
+}
+
diff --git a/openbsc/src/gprs/gtphub_vty.c b/openbsc/src/gprs/gtphub_vty.c
new file mode 100644
index 0000000..2227d48
--- /dev/null
+++ b/openbsc/src/gprs/gtphub_vty.c
@@ -0,0 +1,258 @@
+/* (C) 2015 by sysmocom s.f.m.c. GmbH
+ * All Rights Reserved
+ *
+ * Author: Neels Hofmeyr
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <string.h>
+
+#include <osmocom/core/talloc.h>
+#include <osmocom/vty/command.h>
+
+#include <openbsc/vty.h>
+#include <openbsc/gtphub.h>
+
+static struct gtphub_cfg *g_cfg = 0;
+
+static struct cmd_node gtphub_node = {
+ GTPHUB_NODE,
+ "%s(config-gtphub)# ",
+ 1,
+};
+
+#define GTPH_DEFAULT_CONTROL_PORT 2123
+#define GTPH_DEFAULT_USER_PORT 2152
+
+static void write_addrs(struct vty *vty, const char *name,
+ struct gtphub_cfg_addr *c, struct gtphub_cfg_addr *u)
+{
+ if ((c->port == GTPH_DEFAULT_CONTROL_PORT)
+ && (u->port == GTPH_DEFAULT_USER_PORT)
+ && (strcmp(c->addr_str, u->addr_str) == 0)) {
+ /* Default port numbers and same IP address: write "short"
+ * variant. */
+ vty_out(vty, " %s %s%s",
+ name,
+ c->addr_str,
+ VTY_NEWLINE);
+ return;
+ }
+
+ vty_out(vty, " %s ctrl %s %d user %s %d%s",
+ name,
+ c->addr_str, (int)c->port,
+ u->addr_str, (int)u->port,
+ VTY_NEWLINE);
+}
+
+static int config_write_gtphub(struct vty *vty)
+{
+ vty_out(vty, "gtphub%s", VTY_NEWLINE);
+
+ write_addrs(vty, "bind-to-sgsns",
+ &g_cfg->to_sgsns[GTPH_PORT_CTRL].bind,
+ &g_cfg->to_sgsns[GTPH_PORT_USER].bind);
+
+ write_addrs(vty, "bind-to-ggsns",
+ &g_cfg->to_ggsns[GTPH_PORT_CTRL].bind,
+ &g_cfg->to_ggsns[GTPH_PORT_USER].bind);
+
+ if (g_cfg->ggsn_proxy[GTPH_PORT_CTRL].addr_str) {
+ write_addrs(vty, "ggsn-proxy",
+ &g_cfg->ggsn_proxy[GTPH_PORT_CTRL],
+ &g_cfg->ggsn_proxy[GTPH_PORT_USER]);
+ }
+
+ return CMD_SUCCESS;
+}
+
+DEFUN(cfg_gtphub, cfg_gtphub_cmd,
+ "gtphub",
+ "Configure the GTP hub")
+{
+ vty->node = GTPHUB_NODE;
+ return CMD_SUCCESS;
+}
+
+#define BIND_ARGS "ctrl ADDR <0-65535> user ADDR <0-65535>"
+#define BIND_DOCS \
+ "Set GTP-C bind\n" \
+ "GTP-C local IP address (v4 or v6)\n" \
+ "GTP-C local port\n" \
+ "Set GTP-U bind\n" \
+ "GTP-U local IP address (v4 or v6)\n" \
+ "GTP-U local port\n"
+
+
+DEFUN(cfg_gtphub_bind_to_sgsns_short, cfg_gtphub_bind_to_sgsns_short_cmd,
+ "bind-to-sgsns ADDR",
+ "GTP Hub Parameters\n"
+ "Set the local bind address to listen for SGSNs, for both GTP-C and
GTP-U\n"
+ "Local IP address (v4 or v6)\n"
+ )
+{
+ int i;
+ for (i = 0; i < GTPH_PORT_N; i++)
+ g_cfg->to_sgsns[i].bind.addr_str = talloc_strdup(tall_vty_ctx,
argv[0]);
+ g_cfg->to_sgsns[GTPH_PORT_CTRL].bind.port = GTPH_DEFAULT_CONTROL_PORT;
+ g_cfg->to_sgsns[GTPH_PORT_USER].bind.port = GTPH_DEFAULT_USER_PORT;
+ return CMD_SUCCESS;
+}
+
+DEFUN(cfg_gtphub_bind_to_ggsns_short, cfg_gtphub_bind_to_ggsns_short_cmd,
+ "bind-to-ggsns ADDR",
+ "GTP Hub Parameters\n"
+ "Set the local bind address to listen for GGSNs, for both GTP-C and
GTP-U\n"
+ "Local IP address (v4 or v6)\n"
+ )
+{
+ int i;
+ for (i = 0; i < GTPH_PORT_N; i++)
+ g_cfg->to_ggsns[i].bind.addr_str = talloc_strdup(tall_vty_ctx,
argv[0]);
+ g_cfg->to_ggsns[GTPH_PORT_CTRL].bind.port = GTPH_DEFAULT_CONTROL_PORT;
+ g_cfg->to_ggsns[GTPH_PORT_USER].bind.port = GTPH_DEFAULT_USER_PORT;
+ return CMD_SUCCESS;
+}
+
+
+static int handle_binds(struct gtphub_cfg_bind *b, const char **argv)
+{
+ b[GTPH_PORT_CTRL].bind.addr_str = talloc_strdup(tall_vty_ctx, argv[0]);
+ b[GTPH_PORT_CTRL].bind.port = atoi(argv[1]);
+ b[GTPH_PORT_USER].bind.addr_str = talloc_strdup(tall_vty_ctx, argv[2]);
+ b[GTPH_PORT_USER].bind.port = atoi(argv[3]);
+ return CMD_SUCCESS;
+}
+
+DEFUN(cfg_gtphub_bind_to_sgsns, cfg_gtphub_bind_to_sgsns_cmd,
+ "bind-to-sgsns " BIND_ARGS,
+ "GTP Hub Parameters\n"
+ "Set the local bind addresses and ports to listen for SGSNs\n"
+ BIND_DOCS
+ )
+{
+ return handle_binds(g_cfg->to_sgsns, argv);
+}
+
+DEFUN(cfg_gtphub_bind_to_ggsns, cfg_gtphub_bind_to_ggsns_cmd,
+ "bind-to-ggsns " BIND_ARGS,
+ "GTP Hub Parameters\n"
+ "Set the local bind addresses and ports to listen for GGSNs\n"
+ BIND_DOCS
+ )
+{
+ return handle_binds(g_cfg->to_ggsns, argv);
+}
+
+DEFUN(cfg_gtphub_ggsn_proxy_short, cfg_gtphub_ggsn_proxy_short_cmd,
+ "ggsn-proxy ADDR",
+ "GTP Hub Parameters\n"
+ "Redirect all GGSN bound traffic to default ports on this address
(another gtphub)\n"
+ "Remote IP address (v4 or v6)\n"
+ )
+{
+ g_cfg->ggsn_proxy[GTPH_PORT_CTRL].addr_str =
talloc_strdup(tall_vty_ctx, argv[0]);
+ g_cfg->ggsn_proxy[GTPH_PORT_CTRL].port = GTPH_DEFAULT_CONTROL_PORT;
+ g_cfg->ggsn_proxy[GTPH_PORT_USER].addr_str =
talloc_strdup(tall_vty_ctx, argv[0]);
+ g_cfg->ggsn_proxy[GTPH_PORT_USER].port = GTPH_DEFAULT_USER_PORT;
+ return CMD_SUCCESS;
+}
+
+DEFUN(cfg_gtphub_ggsn_proxy, cfg_gtphub_ggsn_proxy_cmd,
+ "ggsn-proxy " BIND_ARGS,
+ "GTP Hub Parameters\n"
+ "Redirect all GGSN bound traffic to these addresses and ports (another
gtphub)\n"
+ BIND_DOCS
+ )
+{
+ g_cfg->ggsn_proxy[GTPH_PORT_CTRL].addr_str =
talloc_strdup(tall_vty_ctx, argv[0]);
+ g_cfg->ggsn_proxy[GTPH_PORT_CTRL].port = atoi(argv[1]);
+ g_cfg->ggsn_proxy[GTPH_PORT_USER].addr_str =
talloc_strdup(tall_vty_ctx, argv[2]);
+ g_cfg->ggsn_proxy[GTPH_PORT_USER].port = atoi(argv[3]);
+ return CMD_SUCCESS;
+}
+
+DEFUN(cfg_gtphub_sgsn_proxy_short, cfg_gtphub_sgsn_proxy_short_cmd,
+ "sgsn-proxy ADDR",
+ "GTP Hub Parameters\n"
+ "Redirect all SGSN bound traffic to default ports on this address
(another gtphub)\n"
+ "Remote IP address (v4 or v6)\n"
+ )
+{
+ g_cfg->sgsn_proxy[GTPH_PORT_CTRL].addr_str =
talloc_strdup(tall_vty_ctx, argv[0]);
+ g_cfg->sgsn_proxy[GTPH_PORT_CTRL].port = GTPH_DEFAULT_CONTROL_PORT;
+ g_cfg->sgsn_proxy[GTPH_PORT_USER].addr_str =
talloc_strdup(tall_vty_ctx, argv[0]);
+ g_cfg->sgsn_proxy[GTPH_PORT_USER].port = GTPH_DEFAULT_USER_PORT;
+ return CMD_SUCCESS;
+}
+
+DEFUN(cfg_gtphub_sgsn_proxy, cfg_gtphub_sgsn_proxy_cmd,
+ "sgsn-proxy " BIND_ARGS,
+ "GTP Hub Parameters\n"
+ "Redirect all SGSN bound traffic to these addresses and ports (another
gtphub)\n"
+ BIND_DOCS
+ )
+{
+ g_cfg->sgsn_proxy[GTPH_PORT_CTRL].addr_str =
talloc_strdup(tall_vty_ctx, argv[0]);
+ g_cfg->sgsn_proxy[GTPH_PORT_CTRL].port = atoi(argv[1]);
+ g_cfg->sgsn_proxy[GTPH_PORT_USER].addr_str =
talloc_strdup(tall_vty_ctx, argv[2]);
+ g_cfg->sgsn_proxy[GTPH_PORT_USER].port = atoi(argv[3]);
+ return CMD_SUCCESS;
+}
+
+DEFUN(show_gtphub, show_gtphub_cmd, "show gtphub",
+ SHOW_STR "Display information about the GTP hub")
+{
+ vty_out(vty, "gtphub has nothing to say yet%s", VTY_NEWLINE);
+ return CMD_SUCCESS;
+}
+
+
+int gtphub_vty_init(void)
+{
+ install_element_ve(&show_gtphub_cmd);
+
+ install_element(CONFIG_NODE, &cfg_gtphub_cmd);
+ install_node(>phub_node, config_write_gtphub);
+ vty_install_default(GTPHUB_NODE);
+
+ install_element(GTPHUB_NODE, &cfg_gtphub_bind_to_sgsns_short_cmd);
+ install_element(GTPHUB_NODE, &cfg_gtphub_bind_to_sgsns_cmd);
+ install_element(GTPHUB_NODE, &cfg_gtphub_bind_to_ggsns_short_cmd);
+ install_element(GTPHUB_NODE, &cfg_gtphub_bind_to_ggsns_cmd);
+ install_element(GTPHUB_NODE, &cfg_gtphub_ggsn_proxy_short_cmd);
+ install_element(GTPHUB_NODE, &cfg_gtphub_ggsn_proxy_cmd);
+ install_element(GTPHUB_NODE, &cfg_gtphub_sgsn_proxy_short_cmd);
+ install_element(GTPHUB_NODE, &cfg_gtphub_sgsn_proxy_cmd);
+
+ return 0;
+}
+
+int gtphub_cfg_read(struct gtphub_cfg *cfg, const char *config_file)
+{
+ int rc;
+
+ g_cfg = cfg;
+
+ rc = vty_read_config_file(config_file, NULL);
+ if (rc < 0) {
+ fprintf(stderr, "Failed to parse the config file: '%s'\n",
config_file);
+ return rc;
+ }
+
+ return 0;
+}
diff --git a/openbsc/tests/Makefile.am b/openbsc/tests/Makefile.am
index 1b557d4..aacfe0b 100644
--- a/openbsc/tests/Makefile.am
+++ b/openbsc/tests/Makefile.am
@@ -1,4 +1,4 @@
-SUBDIRS = gsm0408 db channel mgcp gprs abis gbproxy trau subscr oap
+SUBDIRS = gsm0408 db channel mgcp gprs abis gbproxy trau subscr oap gtphub
if BUILD_NAT
SUBDIRS += bsc-nat bsc-nat-trie
diff --git a/openbsc/tests/gtphub/Makefile.am b/openbsc/tests/gtphub/Makefile.am
new file mode 100644
index 0000000..ecc6d62
--- /dev/null
+++ b/openbsc/tests/gtphub/Makefile.am
@@ -0,0 +1,20 @@
+AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include
+AM_CFLAGS=-Wall -ggdb3 $(LIBOSMOCORE_CFLAGS)
+
+EXTRA_DIST = \
+ gtphub_test.ok \
+ gtphub_nc_test.sh \
+ gtphub_nc_test.ok \
+ hex2bin.py
+
+noinst_PROGRAMS = gtphub_test
+
+gtphub_test_SOURCES = gtphub_test.c
+gtphub_test_LDFLAGS = \
+ -Wl,--wrap=gtphub_resolve_ggsn_addr
+
+gtphub_test_LDADD = \
+ $(top_builddir)/src/gprs/gtphub.o \
+ $(LIBOSMOCORE_LIBS) \
+ -lgtp -lrt
+
diff --git a/openbsc/tests/gtphub/gtphub_nc_test.gtphub.conf
b/openbsc/tests/gtphub/gtphub_nc_test.gtphub.conf
new file mode 100644
index 0000000..17cc756
--- /dev/null
+++ b/openbsc/tests/gtphub/gtphub_nc_test.gtphub.conf
@@ -0,0 +1,5 @@
+gtphub
+ bind-to-sgsns ctrl 127.0.0.1 21231 user 127.0.0.1 21521
+ bind-to-ggsns ctrl 127.0.0.1 21232 user 127.0.0.1 21522
+ ggsn-proxy 127.0.0.1
+end
diff --git a/openbsc/tests/gtphub/gtphub_nc_test.ok
b/openbsc/tests/gtphub/gtphub_nc_test.ok
new file mode 100644
index 0000000..6a6db53
--- /dev/null
+++ b/openbsc/tests/gtphub/gtphub_nc_test.ok
@@ -0,0 +1,7 @@
+--- recv_server:
+32 01 00 04 00 00 00 00 6d 31 00 00
+OK
+--- recv_client:
+32 02 00 06 00 00 00 00 7c 00 00 00 0e 01
+OK
+done
diff --git a/openbsc/tests/gtphub/gtphub_nc_test.sh
b/openbsc/tests/gtphub/gtphub_nc_test.sh
new file mode 100755
index 0000000..febb5a7
--- /dev/null
+++ b/openbsc/tests/gtphub/gtphub_nc_test.sh
@@ -0,0 +1,85 @@
+#!/usr/bin/env bash
+# gtphub_nc_test.sh
+
+# TODO does this work with all relevant netcat implementations?
+# TODO skip if netcat not found?
+# TODO use only 127.0.0.1 once gtphub is configurable.
+
+dump() {
+ # echo result to strip trailing space
+ echo $(hexdump -v -e '/1 "%02x "' $@)
+}
+
+sendhex() {
+ hex="$1"
+ from_port="$2"
+ to_port="$3"
+ echo "$hex" | ./hex2bin.py | nc --send-only -u -s 127.0.0.1 -p "$from_port"
127.0.0.1 "$to_port"
+}
+
+gtphub_bin="./osmo-gtphub"
+if [ ! -x "$gtphub_bin" ]; then
+ echo "executable not found: $gtphub_bin"
+ exit 1;
+fi
+
+# client osmo-gtphub gtp server
+# 127.0.0.1:9876 <--> 127.0.0.1:21231 | 127.0.0.1:21232 <--> 127.0.0.1 2123
+# (netcat) ($gtphub_bin) (netcat)
+
+# start gtphub relay
+"$gtphub_bin" -c gtphub.conf &
+sleep 0.1
+
+# log what reaches client and server
+nc --recv-only -u -l -p 9876 -s 127.0.0.1 > recv_client &
+nc --recv-only -u -l -p 2123 -s 127.0.0.1 > recv_server &
+sleep .1
+
+# send test messages, both ways...
+# When sending the ping, the sequence number gets mapped (7c00 -> 6d31).
+# In the pong, the mapped sequence nr is sent and gets mapped backwards.
+gtp_ping_seq1="32 01 00 04 00 00 00 00 7c 00 00 00"
+gtp_ping_seq2="32 01 00 04 00 00 00 00 6d 31 00 00"
+gtp_pong_seq2="32 02 00 06 00 00 00 00 6d 31 00 00 0e 01"
+gtp_pong_seq1="32 02 00 06 00 00 00 00 7c 00 00 00 0e 01"
+
+sendhex "$gtp_ping_seq1" 9876 21231
+
+# server sends reply with the mapped sequence nr., but wrong sender in terms of
+# the configured GGSN proxy address.
+sendhex "$gtp_pong_seq2" 7777 21232
+
+# server sends reply with the mapped sequence nr., correct sender
+sendhex "$gtp_pong_seq2" 2123 21232
+
+sleep .1
+kill %1 %2 %3
+
+# log what has reached the server and client ends, matched against
+# gtphub_nc_test.ok
+retval=0
+rx_srv="$(dump recv_server)"
+echo "--- recv_server:"
+echo "$rx_srv"
+
+if [ "$rx_srv" = "$gtp_ping_seq2" ]; then
+ echo "OK"
+else
+ echo "*** FAILURE"
+ retval=1
+fi
+
+rx_clt="$(dump recv_client)"
+echo "--- recv_client:"
+echo "$rx_clt"
+
+if [ "$rx_clt" = "$gtp_pong_seq1" ]; then
+ echo "OK"
+else
+ echo "*** FAILURE"
+ retval=2
+fi
+
+echo "done"
+exit "$retval"
diff --git a/openbsc/tests/gtphub/gtphub_test.c
b/openbsc/tests/gtphub/gtphub_test.c
new file mode 100644
index 0000000..5a5c4d1
--- /dev/null
+++ b/openbsc/tests/gtphub/gtphub_test.c
@@ -0,0 +1,675 @@
+/* Test the GTP hub */
+
+/* (C) 2015 by sysmocom s.f.m.c. GmbH
+ * All Rights Reserved
+ *
+ * Author: Neels Hofmeyr <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <limits.h>
+#include <unistd.h>
+
+#include <osmocom/core/utils.h>
+#include <osmocom/core/msgb.h>
+#include <osmocom/core/application.h>
+
+#include <openbsc/debug.h>
+
+#include <openbsc/gtphub.h>
+#include <gtp.h>
+#include <gtpie.h>
+
+#define EXPIRE_ALL (gtphub_now() + (60 * GTPH_TEI_MAPPING_EXPIRY_MINUTES) + 1)
+
+/* Make non-public API accessible */
+
+void gtphub_init(struct gtphub *hub);
+
+int gtphub_from_sgsns_handle_buf(struct gtphub *hub,
+ unsigned int port_idx,
+ const struct osmo_sockaddr *from_addr,
+ uint8_t *buf,
+ size_t received,
+ struct osmo_fd **to_ofd,
+ struct osmo_sockaddr **to_addr);
+
+int gtphub_from_ggsns_handle_buf(struct gtphub *hub,
+ unsigned int port_idx,
+ const struct osmo_sockaddr *from_addr,
+ uint8_t *buf,
+ size_t received,
+ struct osmo_fd **to_ofd,
+ struct osmo_sockaddr **to_addr);
+
+void *osmo_gtphub_ctx;
+
+/* TODO copied from libosmo-abis/src/subchan_demux.c, remove dup */
+static int llist_len(struct llist_head *head)
+{
+ struct llist_head *entry;
+ int i = 0;
+
+ llist_for_each(entry, head)
+ i++;
+
+ return i;
+}
+
+static void nr_mapping_free(struct nr_mapping *m)
+{
+ talloc_free(m);
+}
+
+static struct nr_mapping *nr_mapping_alloc(void)
+{
+ struct nr_mapping *m;
+ m = talloc(osmo_gtphub_ctx, struct nr_mapping);
+ nr_mapping_init(m);
+ m->del_cb = nr_mapping_free;
+ return m;
+}
+
+static struct nr_mapping *nr_map_have(struct nr_map *map, void *origin, nr_t
orig, time_t now)
+{
+ struct nr_mapping *mapping;
+
+ mapping = nr_map_get(map, origin, orig);
+ if (!mapping) {
+ mapping = nr_mapping_alloc();
+ mapping->origin = origin;
+ mapping->orig = orig;
+ nr_map_add(map, mapping, now);
+ }
+
+ return mapping;
+}
+
+static nr_t nr_map_verify(const struct nr_map *map, void *origin, nr_t orig,
nr_t expect_repl)
+{
+ struct nr_mapping *m;
+ m = nr_map_get(map, origin, orig);
+
+ if (!m) {
+ printf("mapping not found for %p %d\n", origin, orig);
+ return 0;
+ }
+
+ if (m->repl != expect_repl) {
+ printf("mapping found, but nr mismatches: expect %d, got %d\n",
+ (int)expect_repl, (int)m->repl);
+ return 0;
+ }
+
+ return 1;
+}
+
+static int nr_map_verify_inv(const struct nr_map *map, nr_t repl,
+ void *expect_origin, nr_t expect_orig)
+{
+ struct nr_mapping *m;
+ m = nr_map_get_inv(map, repl);
+ if (!m) {
+ printf("mapping not found for %d\n", (int)repl);
+ return 0;
+ }
+
+ if (m->origin != expect_origin) {
+ printf("mapping found, but origin mismatches: expect %p, got
%p\n",
+ expect_origin, m->origin);
+ return 0;
+ }
+
+ if (m->orig != expect_orig) {
+ printf("mapping found, but nr mismatches: expect %d, got %d\n",
+ (int)expect_orig, (int)m->orig);
+ return 0;
+ }
+
+ return 1;
+}
+
+
+static void test_nr_map_basic(void)
+{
+ struct nr_pool _pool;
+ struct nr_pool *pool = &_pool;
+ struct nr_map _map;
+ struct nr_map *map = &_map;
+
+ nr_pool_init(pool);
+ nr_map_init(map, pool, NULL);
+
+ OSMO_ASSERT(llist_empty(&map->mappings));
+
+#define TEST_N_HALF 100
+#define TEST_N (2*TEST_N_HALF)
+#define TEST_I 123
+ uint32_t i, check_i;
+ uint32_t m[TEST_N];
+ struct nr_mapping *mapping;
+
+ /* create half of TEST_N mappings from one origin */
+ void *origin1 = (void*)0x1234;
+ for (i = 0; i < TEST_N_HALF; i++) {
+ nr_t orig = TEST_I + i;
+ mapping = nr_map_have(map, origin1, orig, 0);
+ m[i] = mapping->repl;
+ OSMO_ASSERT(m[i] != 0);
+ OSMO_ASSERT(llist_len(&map->mappings) == (i+1));
+ for (check_i = 0; check_i < i; check_i++)
+ OSMO_ASSERT(m[check_i] != m[i]);
+ }
+ OSMO_ASSERT(llist_len(&map->mappings) == TEST_N_HALF);
+
+ /* create another TEST_N mappings with the same original numbers, but
+ * from a different origin */
+ void *origin2 = (void*)0x5678;
+ for (i = 0; i < TEST_N_HALF; i++) {
+ int i2 = TEST_N_HALF + i;
+ nr_t orig = TEST_I + i;
+ mapping = nr_map_have(map, origin2, orig, 0);
+ m[i2] = mapping->repl;
+ OSMO_ASSERT(m[i2] != 0);
+ OSMO_ASSERT(llist_len(&map->mappings) == (i2+1));
+ for (check_i = 0; check_i < i2; check_i++)
+ OSMO_ASSERT(m[check_i] != m[i2]);
+ }
+ OSMO_ASSERT(llist_len(&map->mappings) == TEST_N);
+
+ /* verify mappings */
+ for (i = 0; i < TEST_N_HALF; i++) {
+ nr_t orig = TEST_I + i;
+ {
+ OSMO_ASSERT(nr_map_verify(map, origin1, orig, m[i]));
+ OSMO_ASSERT(nr_map_verify_inv(map, m[i], origin1,
orig));
+ }
+ {
+ int i2 = TEST_N_HALF + i;
+ OSMO_ASSERT(nr_map_verify(map, origin2, orig, m[i2]));
+ OSMO_ASSERT(nr_map_verify_inv(map, m[i2], origin2,
orig));
+ }
+ }
+
+ /* remove all mappings */
+ for (i = 0; i < TEST_N_HALF; i++) {
+ OSMO_ASSERT(llist_len(&map->mappings) == (TEST_N - 2*i));
+
+ nr_t orig = TEST_I + i;
+ nr_mapping_del(nr_map_get(map, origin1, orig));
+ nr_mapping_del(nr_map_get(map, origin2, orig));
+ }
+ OSMO_ASSERT(llist_empty(&map->mappings));
+#undef TEST_N
+#undef TEST_I
+}
+
+static int seqmap_is(struct nr_map *map, const char *str)
+{
+ static char buf[4096];
+ char *pos = buf;
+ size_t len = sizeof(buf);
+ struct nr_mapping *m;
+ llist_for_each_entry(m, &map->mappings, entry) {
+ size_t wrote = snprintf(pos, len, "(%d->%d@%d), ",
+ (int)m->orig,
+ (int)m->repl,
+ (int)m->expiry);
+ OSMO_ASSERT(wrote < len);
+ pos += wrote;
+ len -= wrote;
+ }
+ *pos = '\0';
+
+ if (strncmp(buf, str, sizeof(buf)) != 0) {
+ printf("FAILURE: seqmap_is() mismatches expected value:\n"
+ "expected: %s\n"
+ "is: %s\n",
+ str, buf);
+ return 0;
+ }
+ return 1;
+}
+
+static void test_nr_map_expiry(void)
+{
+ struct nr_map_expiry expiry;
+ struct nr_pool pool;
+ struct nr_map map;
+ int i;
+
+ nr_map_expiry_init(&expiry, 30);
+ nr_pool_init(&pool);
+ nr_map_init(&map, &pool, &expiry);
+ OSMO_ASSERT(seqmap_is(&map, ""));
+
+ /* tick on empty map */
+ OSMO_ASSERT(nr_map_expiry_tick(&expiry, 10000) == 0);
+ OSMO_ASSERT(seqmap_is(&map, ""));
+
+#define MAP1 \
+ "(10->1@10040), " \
+ ""
+
+#define MAP2 \
+ "(20->2@10050), " \
+ "(21->3@10051), " \
+ "(22->4@10052), " \
+ "(23->5@10053), " \
+ "(24->6@10054), " \
+ "(25->7@10055), " \
+ "(26->8@10056), " \
+ "(27->9@10057), " \
+ ""
+
+#define MAP3 \
+ "(420->10@10072), " \
+ "(421->11@10072), " \
+ "(422->12@10072), " \
+ "(423->13@10072), " \
+ "(424->14@10072), " \
+ "(425->15@10072), " \
+ "(426->16@10072), " \
+ "(427->17@10072), " \
+ ""
+
+ /* add mapping at time 10010. */
+ nr_map_have(&map, 0, 10, 10010);
+ OSMO_ASSERT(seqmap_is(&map, MAP1));
+
+ /* tick on unexpired item. */
+ OSMO_ASSERT(nr_map_expiry_tick(&expiry, 10010) == 0);
+ OSMO_ASSERT(nr_map_expiry_tick(&expiry, 10011) == 0);
+ OSMO_ASSERT(seqmap_is(&map, MAP1));
+
+ /* Spread mappings at 10020, 10021, ... 10027. */
+ for (i = 0; i < 8; i++)
+ nr_map_have(&map, 0, 20 + i, 10020 + i);
+ OSMO_ASSERT(seqmap_is(&map, MAP1 MAP2));
+
+ /* tick on unexpired items. */
+ OSMO_ASSERT(nr_map_expiry_tick(&expiry, 10030) == 0);
+ OSMO_ASSERT(nr_map_expiry_tick(&expiry, 10039) == 0);
+ OSMO_ASSERT(seqmap_is(&map, MAP1 MAP2));
+
+ /* expire the first item (from 10010). */
+ OSMO_ASSERT(nr_map_expiry_tick(&expiry, 10010 + 30) == 1);
+ OSMO_ASSERT(seqmap_is(&map, MAP2));
+
+ /* again nothing to expire */
+ OSMO_ASSERT(nr_map_expiry_tick(&expiry, 10041) == 0);
+ OSMO_ASSERT(seqmap_is(&map, MAP2));
+
+ /* Mappings all at the same time. */
+ for (i = 0; i < 8; i++)
+ nr_map_have(&map, 0, 420 + i, 10042);
+ OSMO_ASSERT(seqmap_is(&map, MAP2 MAP3));
+
+ /* Eight to expire, were added further above to be chronologically
+ * correct, at 10020..10027. */
+ OSMO_ASSERT(nr_map_expiry_tick(&expiry, 10027 + 30) == 8);
+ OSMO_ASSERT(seqmap_is(&map, MAP3));
+
+ /* again nothing to expire */
+ OSMO_ASSERT(nr_map_expiry_tick(&expiry, 10027 + 30) == 0);
+ OSMO_ASSERT(seqmap_is(&map, MAP3));
+
+ /* Eight to expire, from 10042. Now at 10042 + 30: */
+ OSMO_ASSERT(nr_map_expiry_tick(&expiry, 10042 + 30) == 8);
+ OSMO_ASSERT(seqmap_is(&map, ""));
+
+#undef MAP1
+#undef MAP2
+#undef MAP3
+}
+
+
+
+/* override, requires '-Wl,--wrap=gtphub_resolve_ggsn_addr' */
+int __real_gtphub_resolve_ggsn_addr(struct gtphub *hub,
+ struct osmo_sockaddr *result,
+ struct gtp_packet_desc *p);
+
+struct osmo_sockaddr resolved_ggsn_addr = {.l = 0};
+int __wrap_gtphub_resolve_ggsn_addr(struct gtphub *hub,
+ struct osmo_sockaddr *result,
+ struct gtp_packet_desc *p)
+{
+ osmo_sockaddr_copy(result, &resolved_ggsn_addr);
+ printf("Wrap: returning GGSN addr: %s\n",
+ osmo_sockaddr_to_str(result));
+ return (resolved_ggsn_addr.l != 0)? 0 : -1;
+}
+
+#define buf_len 1024
+static uint8_t buf[buf_len];
+
+static unsigned int msg(const char *hex)
+{
+ unsigned int l = osmo_hexparse(hex, buf, buf_len);
+ OSMO_ASSERT(l > 0);
+ return l;
+}
+
+/* Compare static buf to given string constant. The amount of bytes is obtained
+ * from parsing the GTP header in buf. hex must match an osmo_hexdump() of the
+ * desired message. Return 1 if size and content match. */
+#define msg_is(MSG) _msg_is(MSG, __FILE__, __LINE__)
+static int _msg_is(const char *hex, const char *file, int line)
+{
+ struct gtp1_header_long *h = (void*)buf;
+ int len = ntoh16(h->length) + 8;
+ const char *dump = osmo_hexdump_nospc(buf, len);
+ int cmp = strcmp(dump, hex);
+
+ if (cmp != 0) {
+ printf("\n%s:%d: msg_is(): MISMATCH\n"
+ " expecting:\n'%s'\n"
+ " got:\n'%s'\n",
+ file,
+ line,
+ hex, dump);
+ int i;
+ int l = strlen(hex);
+ int m = strlen(dump);
+ if (m < l)
+ l = m;
+ for (i = 0; i < l; i++) {
+ if (hex[i] != dump[i]) {
+ printf("First mismatch at position %d:\n"
+ " %s\n %s\n", i, hex + i, dump + i);
+ break;
+ }
+ }
+ }
+ return cmp == 0;
+}
+
+#define same_addr(GOT, EXPECTED) _same_addr((GOT),(EXPECTED), __FILE__,
__LINE__)
+static int _same_addr(const struct osmo_sockaddr *got,
+ const struct osmo_sockaddr *expected,
+ const char *file, int line)
+{
+ int cmp = osmo_sockaddr_cmp(got, expected);
+ if (!cmp)
+ return 1;
+ char buf[256];
+ printf("\n%s:%d: addr_is(): MISMATCH\n"
+ " expecting: '%s'\n"
+ " got: '%s'\n",
+ file, line,
+ osmo_sockaddr_to_str(expected),
+ osmo_sockaddr_to_strb(got, buf, sizeof(buf)));
+ return 0;
+}
+
+static void test_echo(void)
+{
+ struct gtphub _hub;
+ struct gtphub *hub = &_hub;
+
+ gtphub_init(hub);
+
+ const char *gtp_ping_from_sgsn =
+ "32" /* 0b001'1 0010: version 1, protocol GTP, with seq nr.
*/
+ "01" /* type 01: Echo request */
+ "0004" /* length of 4 after header TEI */
+ "00000000" /* header TEI == 0 in Echo */
+ "abcd" /* some 16 octet sequence nr */
+ "0000" /* N-PDU 0, no extension header (why is this here?) */
+ ;
+
+ /* Same with mapped sequence number */
+ const char *gtp_ping_to_ggsn =
+ "32" "01" "0004" "00000000"
+ "6d31" /* mapped seq */
+ "00" "00";
+
+ const char *gtp_pong_from_ggsn =
+ "32"
+ "02" /* type 02: Echo response */
+ "0006" /* len */
+ "00000000" /* tei */
+ "6d31" /* mapped seq */
+ "0000" /* ext */
+ "0e01" /* 0e: Recovery, val == 1 */
+ ;
+ /* Same with unmapped sequence number */
+ const char *gtp_pong_to_sgsn =
+ "32" "02" "0006" "00000000"
+ "abcd" /* unmapped seq */
+ "00" "00" "0e01";
+
+ /* Set the GGSN address that gtphub is forced to resolve to. */
+ OSMO_ASSERT(osmo_sockaddr_init_udp(&resolved_ggsn_addr,
+ "192.168.43.34", 434)
+ == 0);
+
+ /* according to spec, we'd always send to port 2123 instead...
+ struct osmo_sockaddr ggsn_standard_port;
+ OSMO_ASSERT(osmo_sockaddr_init_udp(&ggsn_standard_port,
+ "192.168.43.34", 2123)
+ == 0);
+ */
+
+ struct osmo_sockaddr orig_sgsn_addr;
+ OSMO_ASSERT(osmo_sockaddr_init(&orig_sgsn_addr,
+ AF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP,
+ "192.168.42.23", 423) == 0);
+ struct osmo_fd *ggsn_ofd = NULL;
+ struct osmo_sockaddr *ggsn_addr = NULL;
+ int send;
+ send = gtphub_from_sgsns_handle_buf(hub, GTPH_PORT_CTRL,
&orig_sgsn_addr,
+ buf, msg(gtp_ping_from_sgsn),
+ &ggsn_ofd, &ggsn_addr);
+ OSMO_ASSERT(send > 0);
+ OSMO_ASSERT(ggsn_addr);
+ OSMO_ASSERT(same_addr(ggsn_addr, &resolved_ggsn_addr));
+ OSMO_ASSERT(msg_is(gtp_ping_to_ggsn));
+
+ struct osmo_fd *sgsn_ofd;
+ struct osmo_sockaddr *sgsn_addr;
+ send = gtphub_from_ggsns_handle_buf(hub, GTPH_PORT_CTRL, ggsn_addr,
+ buf, msg(gtp_pong_from_ggsn),
+ &sgsn_ofd, &sgsn_addr);
+ OSMO_ASSERT(send > 0);
+ OSMO_ASSERT(sgsn_addr);
+ OSMO_ASSERT(same_addr(sgsn_addr, &orig_sgsn_addr));
+ OSMO_ASSERT(msg_is(gtp_pong_to_sgsn));
+
+ gtphub_gc(hub, EXPIRE_ALL);
+}
+
+static void test_create_pdp_ctx(void)
+{
+ struct gtphub _hub;
+ struct gtphub *hub = &_hub;
+
+ gtphub_init(hub);
+
+ /* This is copied from a packet that sgsnemu sends. */
+ const char *gtp_req_from_sgsn =
+ "32" /* 0b001'1 0010: version 1, protocol GTP, with seq nr.
*/
+ "10" /* type 16: Create PDP Context Request */
+ "0067" /* length = 8 + 103 */
+ "00000000" /* No TEI yet */
+ "abcd" /* Sequence nr */
+ "00" /* N-PDU 0 */
+ "00" /* No extensions */
+ /* IEs */
+ "02" /* 2 = IMSI */
+ "42000121436587f9"
+ "0e" "60" /* 14: Recovery = 96 */
+ "0f01" /* 15: Selection mode = MS provided APN, subscription
not verified*/
+ "10" /* 16: TEI Data I */
+ "00000123"
+ "11" /* 17: TEI Control Plane */
+ "00000321"
+ "1400" /* 20: NSAPI = 0*/
+ "1a" /* 26: Charging Characteristics */
+ "0800"
+ "80" /* 128: End User Address */
+ "0002" /* length = 2: empty PDP Address */
+ "f121" /* spare 0xf0, PDP organization 1, PDP type number
0x21 = 33 */
+ "83" /* 131: Access Point Name */
+ "0008" /* length = 8 */
+ "696e7465726e6574" /* "internet" */
+ "84" /* 132: Protocol Configuration Options */
+ "0015" /* length = 21 */
+ "80c0231101010011036d69670868656d6d656c6967"
+ "85" /* 133: GSN Address */
+ "0004" /* length */
+ "7f000001"
+ "85" /* 133: GSN Address (second entry) */
+ "0004" /* length */
+ "7f000001"
+ "86" /* 134: MS International PSTN/ISDN Number (MSISDN) */
+ "0007" /* length */
+ "916407123254f6" /* 1946702123456(f) */
+ "87" /* 135: Quality of Service (QoS) Profile */
+ "0004" /* length */
+ "00" /* priority */
+ "0b921f" /* QoS profile data */
+ ;
+
+ const char *gtp_req_to_ggsn =
+ "32" "10" "0067" "00000000"
+ "6d31" /* mapped seq ("abcd") */
+ "00" "00" "02" "42000121436587f9" "0e60" "0f01"
+ "10" "00000001" /* mapped TEI Data I ("123") */
+ "11" "00000001" /* mapped TEI Control ("321") */
+ "1400" "1a" "0800" "80" "0002" "f121" "83"
+ "0008" "696e7465726e6574" "84" "0015"
+ "80c0231101010011036d69670868656d6d656c6967" "85" "0004"
+ "7f000001" "85" "0004" "7f000001" "86" "0007" "916407123254f6"
+ "87" "0004" "00" "0b921f"
+ ;
+
+ const char *gtp_resp_from_ggsn =
+ "32"
+ "11" /* Create PDP Context Response */
+ "004e" /* length = 78 + 8 */
+ "00000001" /* destination TEI (sent in req above) */
+ "6d31" /* mapped seq */
+ "00" "00"
+ /* IEs */
+ "01" /* 1: Cause */
+ "80" /* value = 0b10000000 = response, no rejection. */
+ "08" /* 8: Reordering Required */
+ "00" /* not required. */
+ "0e" "01" /* 14: Recovery = 1 */
+ "10" /* 16: TEI Data I */
+ "00000567"
+ "11" /* 17: TEI Control */
+ "00000765"
+ "7f" /* 127: Charging ID */
+ "00000001"
+ "80" /* 128: End User Address */
+ "0006" /* length = 6 */
+ "f121" /* spare 0xf0, PDP organization 1, PDP type number
0x21 = 33 */
+ "7f000002"
+ "84" /* 132: Protocol Configuration Options */
+ "0014" /* len = 20 */
+ "8080211002000010810608080808830600000000"
+ "85" /* 133: GSN Address */
+ "0004" /* length */
+ "7f000002"
+ "85" /* 133: GSN Address (again) */
+ "0004" /* length */
+ "7f000002"
+ "87" /* 135: Quality of Service (QoS) Profile */
+ "0004" /* length */
+ "00" /* priority */
+ "0b921f" /* QoS profile data */
+ ;
+
+ const char *gtp_resp_to_sgsn =
+ "32" "11" "004e"
+ "00000321" /* unmapped TEI ("001") */
+ "abcd" /* unmapped seq ("6d31") */
+ "00" "00" "01" "80" "08" "00" "0e" "01"
+ "10" "00000001" /* mapped TEI from GGSN ("567") */
+ "11" "00000001" /* mapped TEI from GGSN ("765") */
+ "7f" "00000001" "80" "0006" "f121" "7f000002" "84" "0014"
+ "8080211002000010810608080808830600000000" "85" "0004"
+ "7f000002" "85" "0004" "7f000002" "87" "0004" "00" "0b921f"
+ ;
+
+ /* Set the GGSN address that gtphub is forced to resolve to. */
+ OSMO_ASSERT(osmo_sockaddr_init_udp(&resolved_ggsn_addr,
+ "192.168.43.34", 434)
+ == 0);
+
+ struct osmo_sockaddr orig_sgsn_addr;
+ OSMO_ASSERT(osmo_sockaddr_init(&orig_sgsn_addr,
+ AF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP,
+ "192.168.42.23", 423) == 0);
+ struct osmo_fd *ggsn_ofd = NULL;
+ struct osmo_sockaddr *ggsn_addr = NULL;
+ int send;
+ send = gtphub_from_sgsns_handle_buf(hub, GTPH_PORT_CTRL,
&orig_sgsn_addr,
+ buf, msg(gtp_req_from_sgsn),
+ &ggsn_ofd, &ggsn_addr);
+ OSMO_ASSERT(send > 0);
+ OSMO_ASSERT(ggsn_addr);
+ OSMO_ASSERT(same_addr(ggsn_addr, &resolved_ggsn_addr));
+ OSMO_ASSERT(msg_is(gtp_req_to_ggsn));
+
+ struct osmo_fd *sgsn_ofd;
+ struct osmo_sockaddr *sgsn_addr;
+ send = gtphub_from_ggsns_handle_buf(hub, GTPH_PORT_CTRL, ggsn_addr,
+ buf, msg(gtp_resp_from_ggsn),
+ &sgsn_ofd, &sgsn_addr);
+ OSMO_ASSERT(send > 0);
+ OSMO_ASSERT(sgsn_addr);
+ OSMO_ASSERT(same_addr(sgsn_addr, &orig_sgsn_addr));
+ OSMO_ASSERT(msg_is(gtp_resp_to_sgsn));
+
+ gtphub_gc(hub, EXPIRE_ALL);
+}
+
+static struct log_info_cat gtphub_categories[] = {
+ [DGTPHUB] = {
+ .name = "DGTPHUB",
+ .description = "GTP Hub",
+ .color = "\033[1;33m",
+ .enabled = 1, .loglevel = LOGL_NOTICE,
+ },
+};
+
+static struct log_info info = {
+ .cat = gtphub_categories,
+ .num_cat = ARRAY_SIZE(gtphub_categories),
+};
+
+int main(int argc, char **argv)
+{
+ osmo_init_logging(&info);
+ osmo_gtphub_ctx = talloc_named_const(NULL, 0, "osmo_gtphub");
+
+ test_nr_map_basic();
+ test_nr_map_expiry();
+ test_echo();
+ test_create_pdp_ctx();
+ printf("Done\n");
+
+ talloc_report_full(osmo_gtphub_ctx, stderr);
+ OSMO_ASSERT(talloc_total_blocks(osmo_gtphub_ctx) == 1);
+ return 0;
+}
+
diff --git a/openbsc/tests/gtphub/gtphub_test.ok
b/openbsc/tests/gtphub/gtphub_test.ok
new file mode 100644
index 0000000..7be13fe
--- /dev/null
+++ b/openbsc/tests/gtphub/gtphub_test.ok
@@ -0,0 +1,3 @@
+Wrap: returning GGSN addr: 192.168.43.34 port 434
+Wrap: returning GGSN addr: 192.168.43.34 port 434
+Done
diff --git a/openbsc/tests/gtphub/hex2bin.py b/openbsc/tests/gtphub/hex2bin.py
new file mode 100755
index 0000000..6a906b1
--- /dev/null
+++ b/openbsc/tests/gtphub/hex2bin.py
@@ -0,0 +1,13 @@
+#!/usr/bin/env python
+
+import sys
+
+blob = []
+
+for l in sys.stdin.readlines():
+ l = ''.join(c for c in l if not c.isspace())
+
+ for i in range(0, len(l), 2):
+ h = l[i:i+2]
+ sys.stdout.write(chr(int(h, 16)))
+
diff --git a/openbsc/tests/testsuite.at b/openbsc/tests/testsuite.at
index 78aa47e..3a5883e 100644
--- a/openbsc/tests/testsuite.at
+++ b/openbsc/tests/testsuite.at
@@ -110,3 +110,15 @@ AT_CHECK([test "$enable_oap_test" != no || exit 77])
cat $abs_srcdir/oap/oap_test.ok > expout
AT_CHECK([$abs_top_builddir/tests/oap/oap_test], [], [expout], [ignore])
AT_CLEANUP
+
+AT_SETUP([gtphub])
+AT_KEYWORDS([gtphub])
+AT_CHECK([test "$enable_gtphub_test" != no || exit 77])
+cat $abs_srcdir/gtphub/gtphub_test.ok > expout
+AT_CHECK([$abs_top_builddir/tests/gtphub/gtphub_test], [], [expout], [ignore])
+cat $abs_srcdir/gtphub/gtphub_nc_test.ok > expout
+cat $abs_srcdir/gtphub/gtphub_nc_test.gtphub.conf > gtphub.conf
+ln -s $abs_srcdir/gtphub/hex2bin.py .
+ln -s $abs_top_builddir/src/gprs/osmo-gtphub .
+AT_CHECK([$abs_top_builddir/tests/gtphub/gtphub_nc_test.sh], [], [expout],
[ignore])
+AT_CLEANUP
--
2.1.4
