Add GTP hub initial code base.
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
diff --git a/openbsc/src/gprs/gtphub.c b/openbsc/src/gprs/gtphub.c
new file mode 100644
index 0000000..440f00f
--- /dev/null
+++ b/openbsc/src/gprs/gtphub.c
@@ -0,0 +1,2080 @@
+/* GTP Hub Implementation */
+
+/* (C) 2015 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * 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;
+ uint8_t type;
+ uint16_t seq;
+ uint32_t header_tei;
+ int rc; /* enum gtp_rc */
+ unsigned int plane_idx;
+ union gtpie_member *ie[GTPIE_SIZE];
+};
+
+void gsn_addr_copy(struct gsn_addr *gsna, const struct gsn_addr *src)
+{
+ memcpy(gsna, src, sizeof(struct gsn_addr));
+}
+
+/* Decode sa to gsna. Return 0 on success. If port is non-NULL, the port number
+ * from sa is also returned. */
+int gsn_addr_from_sockaddr(struct gsn_addr *gsna, uint16_t *port,
+ const struct osmo_sockaddr *sa)
+{
+ char addr_str[256];
+ char port_str[6];
+
+ if (osmo_sockaddr_to_strs(addr_str, sizeof(addr_str),
+ port_str, sizeof(port_str),
+ sa, (NI_NUMERICHOST | NI_NUMERICSERV))
+ != 0) {
+ return -1;
+ }
+
+ if (port)
+ *port = atoi(port_str);
+
+ return gsn_addr_from_str(gsna, addr_str);
+}
+
+int gsn_addr_from_str(struct gsn_addr *gsna, const char *numeric_addr_str)
+{
+ int af = AF_INET;
+ gsna->len = 4;
+ const char *pos = numeric_addr_str;
+ for (; *pos; pos++) {
+ if (*pos == ':') {
+ af = AF_INET6;
+ gsna->len = 16;
+ break;
+ }
+ }
+
+ int rc = inet_pton(af, numeric_addr_str, gsna->buf);
+ if (rc != 1) {
+ LOGERR("Cannot resolve numeric address: '%s'\n", numeric_addr_str);
+ return -1;
+ }
+ return 0;
+}
+
+const char *gsn_addr_to_str(const struct gsn_addr *gsna)
+{
+ static char buf[INET6_ADDRSTRLEN + 1];
+ return gsn_addr_to_strb(gsna, buf, sizeof(buf));
+}
+
+const char *gsn_addr_to_strb(const struct gsn_addr *gsna,
+ char *strbuf,
+ int strbuf_len)
+{
+ int af;
+ switch (gsna->len) {
+ case 4:
+ af = AF_INET;
+ break;
+ case 16:
+ af = AF_INET6;
+ break;
+ default:
+ return NULL;
+ }
+
+ const char *r = inet_ntop(af, gsna->buf, strbuf, strbuf_len);
+ if (!r) {
+ LOGERR("Cannot convert gsn_addr to string: %s: len=%d, buf=%s\n",
+ strerror(errno),
+ (int)gsna->len,
+ osmo_hexdump(gsna->buf, sizeof(gsna->buf)));
+ }
+ return r;
+}
+
+int gsn_addr_same(const struct gsn_addr *a, const struct gsn_addr *b)
+{
+ if (a == b)
+ return 1;
+ if ((!a) || (!b))
+ return 0;
+ if (a->len != b->len)
+ return 0;
+ return (memcmp(a->buf, b->buf, a->len) == 0)? 1 : 0;
+}
+
+static int gsn_addr_get(struct gsn_addr *gsna, const struct gtp_packet_desc *p, int idx)
+{
+ if (p->rc != GTP_RC_PDU)
+ return -1;
+
+ unsigned int len;
+ /* gtpie.h fails to declare gtpie_gettlv()'s first arg as const. */
+ if (gtpie_gettlv((union gtpie_member**)p->ie, GTPIE_GSN_ADDR, idx,
+ &len, gsna->buf, sizeof(gsna->buf))
+ != 0)
+ return -1;
+ gsna->len = len;
+ return 0;
+}
+
+static int gsn_addr_put(const struct gsn_addr *gsna, struct gtp_packet_desc *p, int idx)
+{
+ if (p->rc != GTP_RC_PDU)
+ return -1;
+
+ int ie_idx;
+ ie_idx = gtpie_getie(p->ie, GTPIE_GSN_ADDR, idx);
+
+ if (ie_idx < 0)
+ return -1;
+
+ struct gtpie_tlv *ie = &p->ie[ie_idx]->tlv;
+ int ie_l = ntoh16(ie->l);
+ if (ie_l != gsna->len) {
+ LOG("Not implemented: replace an IE address of different size:"
+ " replace %d with %d\n", (int)ie_l, (int)gsna->len);
+ return -1;
+ }
+
+ memcpy(ie->v, gsna->buf, (int)ie_l);
+ return 0;
+}
+
+/* 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;
+ }
+
+ p->type = ntoh8(pheader->type);
+ p->seq = ntoh16(pheader->seq);
+ p->header_tei = 0; /* TODO */
+
+ 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;
+ }
+
+ p->type = ntoh8(pheader->type);
+ p->header_tei = ntoh32(pheader->tei);
+ p->seq = ntoh16(pheader->seq);
+
+ LOG("|GTPv1\n");
+ LOG("| type = %" PRIu8 " 0x%02" PRIx8 "\n",
+ p->type, p->type);
+ LOG("| length = %" PRIu16 " 0x%04" PRIx16 "\n",
+ ntoh16(pheader->length), ntoh16(pheader->length));
+ LOG("| TEI = %" PRIu32 " 0x%08" PRIx32 "\n",
+ p->header_tei, p->header_tei);
+ LOG("| seq = %" PRIu16 " 0x%04" PRIx16 "\n",
+ p->seq, p->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_plane_idx,
+ struct gtp_packet_desc *res)
+{
+ ZERO_STRUCT(res);
+ res->data = (union gtp_packet*)data;
+ res->data_len = data_len;
+ res->plane_idx = from_plane_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 < 2; i++) {
+ struct gsn_addr addr;
+ if (gsn_addr_get(&addr, res, i) == 0)
+ LOG("| addr %s\n", gsn_addr_to_str(&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
+}
+
+
+/* expiry */
+
+void expiry_init(struct expiry *exq, int expiry_in_seconds)
+{
+ ZERO_STRUCT(exq);
+ exq->expiry_in_seconds = expiry_in_seconds;
+ INIT_LLIST_HEAD(&exq->items);
+}
+
+void expiry_add(struct expiry *exq, struct expiring_item *item, time_t now)
+{
+ item->expiry = now + exq->expiry_in_seconds;
+
+ /* Add/move to the tail to always sort by expiry, ascending. */
+ llist_del(&item->entry);
+ llist_add_tail(&item->entry, &exq->items);
+}
+
+int expiry_tick(struct expiry *exq, time_t now)
+{
+ int expired = 0;
+ struct expiring_item *m, *n;
+ llist_for_each_entry_safe(m, n, &exq->items, entry) {
+ if (m->expiry <= now) {
+ expiring_item_del(m);
+ expired ++;
+ } else {
+ LOG("Not expired: %d > %d\n", (int)m->expiry, (int)now);
+ /* The items are added sorted by expiry. So when we hit
+ * an unexpired entry, only more unexpired ones will
+ * follow. */
+ break;
+ }
+ }
+ return expired;
+}
+
+void expiring_item_init(struct expiring_item *item)
+{
+ ZERO_STRUCT(item);
+ INIT_LLIST_HEAD(&item->entry);
+}
+
+void expiring_item_del(struct expiring_item *item)
+{
+ OSMO_ASSERT(item);
+ llist_del(&item->entry);
+ INIT_LLIST_HEAD(&item->entry);
+ if (item->del_cb) {
+ /* avoid loops */
+ del_cb_t del_cb = item->del_cb;
+ item->del_cb = 0;
+ (del_cb)(item);
+ }
+}
+
+
+/* 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 expiry *exq)
+{
+ ZERO_STRUCT(map);
+ map->pool = pool;
+ map->add_items_to_expiry = exq;
+ INIT_LLIST_HEAD(&map->mappings);
+}
+
+void nr_mapping_init(struct nr_mapping *m)
+{
+ ZERO_STRUCT(m);
+ INIT_LLIST_HEAD(&m->entry);
+ expiring_item_init(&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->add_items_to_expiry)
+ expiry_add(map->add_items_to_expiry,
+ &mapping->expiry_entry,
+ 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);
+ INIT_LLIST_HEAD(&mapping->entry);
+ expiring_item_del(&mapping->expiry_entry);
+}
+
+
+/* gtphub */
+
+const char* const gtphub_plane_idx_names[GTPH_PLANE_N] = {
+ "CTRL",
+ "USER",
+};
+
+const uint16_t gtphub_plane_idx_default_port[GTPH_PLANE_N] = {
+ 2123,
+ 2152,
+};
+
+time_t gtphub_now(void)
+{
+ struct timespec now_tp;
+ OSMO_ASSERT(clock_gettime(CLOCK_MONOTONIC, &now_tp) >= 0);
+ return now_tp.tv_sec;
+}
+
+/* Remove a gtphub_peer from its list and free it. */
+static void gtphub_peer_del(struct gtphub_peer *peer)
+{
+ nr_map_clear(&peer->seq_map);
+ llist_del(&peer->entry);
+ talloc_free(peer);
+}
+
+static void gtphub_peer_addr_del(struct gtphub_peer_addr *pa)
+{
+ OSMO_ASSERT(llist_empty(&pa->ports));
+ llist_del(&pa->entry);
+ talloc_free(pa);
+}
+
+static void gtphub_peer_port_del(struct gtphub_peer_port *pp)
+{
+ OSMO_ASSERT(pp->ref_count == 0);
+ llist_del(&pp->entry);
+ talloc_free(pp);
+}
+
+/* From the information in the gtp_packet_desc, return the address of a GGSN.
+ * Return -1 on error. */
+static struct gtphub_peer_port *gtphub_resolve_ggsn(struct gtphub *hub,
+ struct gtp_packet_desc *p);
+
+/* See gtphub_ext.c (wrapped by unit test) */
+int gtphub_resolve_ggsn_addr(struct gtphub *hub,
+ struct osmo_sockaddr *result,
+ struct gtp_packet_desc *p);
+
+static struct gtphub_peer_port *gtphub_port_find(const struct gtphub_bind *bind,
+ const struct gsn_addr *addr,
+ uint16_t port);
+
+static struct gtphub_peer_port *gtphub_port_have(struct gtphub *hub,
+ struct gtphub_bind *bind,
+ const struct gsn_addr *addr,
+ uint16_t port);
+
+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_bind_init(struct gtphub_bind *b)
+{
+ ZERO_STRUCT(b);
+
+ INIT_LLIST_HEAD(&b->peers);
+}
+
+static int gtphub_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 (gsn_addr_from_str(&b->local_addr, cfg->bind.addr_str) != 0)
+ return -1;
+ 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_port_ref_count_inc(struct gtphub_peer_port *pp)
+{
+ OSMO_ASSERT(pp->ref_count < UINT_MAX);
+ pp->ref_count++;
+}
+
+inline void gtphub_port_ref_count_dec(struct gtphub_peer_port *pp)
+{
+ OSMO_ASSERT(pp->ref_count > 0);
+ pp->ref_count--;
+}
+
+inline void set_seq(struct gtp_packet_desc *p, uint16_t seq)
+{
+ OSMO_ASSERT(p->version == 1);
+ p->data->gtp1l.h.seq = hton16(seq);
+ p->seq = seq;
+}
+
+inline void set_tei(struct gtp_packet_desc *p, uint32_t tei)
+{
+ OSMO_ASSERT(p->version == 1);
+ p->data->gtp1l.h.tei = hton32(tei);
+ p->header_tei = tei;
+}
+
+static void gtphub_mapping_del_cb(struct expiring_item *expi);
+
+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->expiry_entry.del_cb = gtphub_mapping_del_cb;
+ return nrm;
+}
+
+static const char *gtphub_peer_strb(struct gtphub_peer *peer, char *buf, int buflen)
+{
+ if (llist_empty(&peer->addresses))
+ return "(addressless)";
+
+ struct gtphub_peer_addr *a = llist_first(&peer->addresses,
+ struct gtphub_peer_addr,
+ entry);
+ return gsn_addr_to_strb(&a->addr, buf, buflen);
+}
+
+static const char *gtphub_port_strb(struct gtphub_peer_port *port, char *buf, int buflen)
+{
+ if (!port)
+ return "(null port)";
+
+ snprintf(buf, buflen, "%s port %d",
+ gsn_addr_to_str(&port->peer_addr->addr),
+ (int)port->port);
+ return buf;
+}
+
+const char *gtphub_peer_str(struct gtphub_peer *peer)
+{
+ static char buf[256];
+ return gtphub_peer_strb(peer, buf, sizeof(buf));
+}
+
+const char *gtphub_peer_str2(struct gtphub_peer *peer)
+{
+ static char buf[256];
+ return gtphub_peer_strb(peer, buf, sizeof(buf));
+}
+
+static const char *gtphub_port_str(struct gtphub_peer_port *port)
+{
+ static char buf[256];
+ return gtphub_port_strb(port, buf, sizeof(buf));
+}
+
+static const char *gtphub_port_str2(struct gtphub_peer_port *port)
+{
+ static char buf[256];
+ return gtphub_port_strb(port, buf, sizeof(buf));
+}
+
+static void gtphub_mapping_del_cb(struct expiring_item *expi)
+{
+ expi->del_cb = 0; /* avoid recursion loops */
+
+ struct nr_mapping *nrm = container_of(expi,
+ struct nr_mapping,
+ expiry_entry);
+ llist_del(&nrm->entry);
+ INIT_LLIST_HEAD(&nrm->entry); /* mark unused */
+
+ /* Just for log */
+ struct gtphub_peer_port *from = nrm->origin;
+ OSMO_ASSERT(from);
+ LOG("expired: %d: nr mapping from %s: %d->%d\n",
+ (int)nrm->expiry_entry.expiry,
+ gtphub_port_str(from),
+ (int)nrm->orig, (int)nrm->repl);
+
+ gtphub_port_ref_count_dec(from);
+
+ talloc_free(nrm);
+}
+
+static struct nr_mapping *gtphub_mapping_have(struct nr_map *map,
+ struct gtphub_peer_port *from,
+ nr_t orig_nr,
+ time_t now)
+{
+ 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, now);
+ gtphub_port_ref_count_inc(from);
+ LOG("peer %s: MAP %d --> %d\n",
+ gtphub_port_str(from),
+ (int)(nrm->orig), (int)(nrm->repl));
+ } else {
+ /* restart expiry timeout */
+ expiry_add(map->add_items_to_expiry, &nrm->expiry_entry,
+ now);
+ }
+
+ OSMO_ASSERT(nrm);
+ return nrm;
+}
+
+static uint32_t gtphub_tei_mapping_have(struct gtphub *hub,
+ int plane_idx,
+ struct gtphub_peer_port *from,
+ uint32_t orig_tei,
+ time_t now)
+{
+ struct nr_mapping *nrm = gtphub_mapping_have(&hub->tei_map[plane_idx],
+ from, orig_tei, now);
+ LOG("New %s TEI: (from %s, TEI %d) <-- TEI %d\n",
+ gtphub_plane_idx_names[plane_idx],
+ gtphub_port_str(from),
+ (int)orig_tei, (int)nrm->repl);
+
+ return (uint32_t)nrm->repl;
+}
+
+static int gtphub_map_seq(struct gtp_packet_desc *p,
+ struct gtphub_peer_port *from_port,
+ struct gtphub_peer_port *to_port,
+ time_t now)
+{
+ /* 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_port->peer_addr->peer->seq_map,
+ from_port, p->seq, now);
+
+ /* Change the GTP packet to yield the new, mapped seq nr */
+ set_seq(p, nrm->repl);
+
+ return 0;
+}
+
+static struct gtphub_peer_port *gtphub_unmap_seq(struct gtp_packet_desc *p,
+ struct gtphub_peer_port *responding_port)
+{
+ OSMO_ASSERT(p->version == 1);
+ struct nr_mapping *nrm = nr_map_get_inv(&responding_port->peer_addr->peer->seq_map,
+ p->seq);
+ 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_port *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_port *from,
+ struct gtphub_peer_port *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: Response 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: Response 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: Response 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_port **to_port_p,
+ struct gtphub *hub,
+ struct gtp_packet_desc *p,
+ struct gtphub_peer_port *from_port)
+{
+ OSMO_ASSERT(p->version == 1);
+ *to_port_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. */
+ uint32_t tei = p->header_tei;
+ if (!tei)
+ return 0;
+
+ /* to_peer has previously announced a TEI, which was stored and
+ * mapped in from_peer's tei_map. */
+ struct nr_mapping *nrm;
+ nrm = nr_map_get_inv(&hub->tei_map[p->plane_idx], tei);
+ if (!nrm) {
+ LOGERR("Received unknown TEI %" PRIu32 " from %s\n",
+ tei, gtphub_port_str(from_port));
+ return -1;
+ }
+
+ struct gtphub_peer_port *to_port = nrm->origin;
+ uint32_t unmapped_tei = nrm->orig;
+ set_tei(p, unmapped_tei);
+
+ LOG("Unmapped TEI coming from %s: %d -> %d (to %s)\n",
+ gtphub_port_str(from_port), tei, unmapped_tei,
+ gtphub_port_str2(to_port));
+
+ *to_port_p = to_port;
+ return 0;
+}
+
+/* Read GSN address IEs from p, and make sure these peer addresses exist in
+ * bind[plane_idx] with default ports, in their respective planes (both Ctrl
+ * and User). Map TEIs announced in IEs, and write mapped TEIs in-place into
+ * the packet p. */
+static int gtphub_handle_pdp_ctx_ies(struct gtphub *hub,
+ struct gtphub_bind from_bind[],
+ struct gtphub_bind to_bind[],
+ struct gtp_packet_desc *p,
+ time_t now)
+{
+ OSMO_ASSERT(p->plane_idx == GTPH_PLANE_CTRL);
+
+ int rc;
+ int plane_idx;
+
+ switch (p->type) {
+ case GTP_CREATE_PDP_REQ:
+ case GTP_CREATE_PDP_RSP:
+ /* Go for it below */
+ break;
+ default:
+ /* Nothing to do for this message type. */
+ return 0;
+ }
+
+ /* TODO enforce a Request only from SGSN, a Response only from GGSN? */
+
+ osmo_static_assert((GTPH_PLANE_CTRL == 0) && (GTPH_PLANE_USER == 1),
+ plane_nrs_match_GSN_addr_IE_indices);
+
+ uint8_t ie_type[] = { GTPIE_TEI_C, GTPIE_TEI_DI };
+ int ie_mandatory = (p->type == GTP_CREATE_PDP_REQ);
+
+ for (plane_idx = 0; plane_idx < 2; plane_idx++) {
+ struct gsn_addr addr_from_ie;
+ uint32_t tei_from_ie;
+ int ie_idx;
+
+ /* Fetch GSN Address and TEI from IEs */
+ rc = gsn_addr_get(&addr_from_ie, p, plane_idx);
+ if (rc) {
+ LOGERR("Cannot read %s GSN Address IE\n",
+ gtphub_plane_idx_names[plane_idx]);
+ return -1;
+ }
+ LOG("Read %s GSN addr %s (%d)\n",
+ gtphub_plane_idx_names[plane_idx],
+ gsn_addr_to_str(&addr_from_ie),
+ addr_from_ie.len);
+
+ ie_idx = gtpie_getie(p->ie, ie_type[plane_idx], 0);
+ if (ie_idx < 0) {
+ if (ie_mandatory) {
+ LOGERR("Create PDP Context message invalid:"
+ " missing IE %d\n", (int)ie_type[plane_idx]);
+ return -1;
+ }
+ tei_from_ie = 0;
+ }
+ else
+ tei_from_ie = ntoh32(p->ie[ie_idx]->tv4.v);
+
+ /* Make sure an entry for this peer address with default port
+ * exists */
+ struct gtphub_peer_port *peer_from_ie =
+ gtphub_port_have(hub, &from_bind[plane_idx],
+ &addr_from_ie,
+ gtphub_plane_idx_default_port[plane_idx]);
+
+ if (tei_from_ie) {
+ /* Create TEI mapping and replace in GTP packet IE */
+ uint32_t mapped_tei =
+ gtphub_tei_mapping_have(hub, plane_idx,
+ peer_from_ie,
+ tei_from_ie,
+ now);
+ p->ie[ie_idx]->tv4.v = hton32(mapped_tei);
+ }
+
+ /* Replace the GSN address to reflect gtphub. */
+ rc = gsn_addr_put(&to_bind[plane_idx].local_addr, p, plane_idx);
+ if (rc) {
+ LOGERR("Cannot write %s GSN Address IE\n",
+ gtphub_plane_idx_names[plane_idx]);
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+static int gtphub_write(const struct osmo_fd *to,
+ const struct osmo_sockaddr *to_addr,
+ const 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;
+}
+
+static int from_ggsns_read_cb(struct osmo_fd *from_ggsns_ofd, unsigned int what)
+{
+ unsigned int plane_idx = from_ggsns_ofd->priv_nr;
+ OSMO_ASSERT(plane_idx < GTPH_PLANE_N);
+ LOG("\n\n=== reading from GGSN (%s)\n", gtphub_plane_idx_names[plane_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, plane_idx, &from_addr, buf, len,
+ gtphub_now(),
+ &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_port *from,
+ struct gtphub_peer_port *to_proxy,
+ struct gtphub_peer_port **final_unmapped,
+ struct gtphub_peer_port **unmapped_from_seq,
+ struct gtphub_peer_port **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_port *from_seq = NULL;
+ struct gtphub_peer_port *from_tei = NULL;
+ struct gtphub_peer_port *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;
+
+ struct gtphub_peer *from_peer = from->peer_addr->peer;
+ if (from_seq && from_tei && (from_seq != from_tei)) {
+ 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_plane_idx_names[p->plane_idx],
+ gtphub_peer_str(from_peer),
+ (int)p->seq,
+ gtphub_port_str(from_seq),
+ (int)p->header_tei,
+ gtphub_port_str2(from_tei)
+ );
+ }
+ unmapped = (from_seq? from_seq : from_tei);
+
+ if (unmapped && to_proxy && (unmapped != to_proxy)) {
+ LOGERR("Unmap yields a different peer than the configured proxy. Using proxy."
+ " unmapped: %s proxy: %s\n",
+ gtphub_port_str(unmapped),
+ gtphub_port_str2(to_proxy)
+ );
+ }
+ 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;
+}
+
+static int gsn_addr_to_sockaddr(struct gsn_addr *src,
+ uint16_t port,
+ struct osmo_sockaddr *dst)
+{
+ return osmo_sockaddr_init_udp(dst, gsn_addr_to_str(src), port);
+}
+
+static int gtphub_handle_echo(const struct gtp_packet_desc *p)
+{
+ /* TODO */
+ return 0;
+}
+
+/* Parse buffer as GTP packet, replace elements in-place and return the ofd and
+ * address to forward to. Return a pointer to the osmo_fd, but copy the
+ * sockaddr to *to_addr. The reason for this is that the sockaddr may expire at
+ * any moment, while the osmo_fd is guaranteed to persist. Return the number of
+ * bytes to forward, 0 or less on failure. */
+int gtphub_from_ggsns_handle_buf(struct gtphub *hub,
+ unsigned int plane_idx,
+ const struct osmo_sockaddr *from_addr,
+ uint8_t *buf,
+ size_t received,
+ time_t now,
+ struct osmo_fd **to_ofd,
+ struct osmo_sockaddr *to_addr)
+{
+ LOG("<- rx from GGSN %s\n", osmo_sockaddr_to_str(from_addr));
+
+ *to_ofd = &hub->to_sgsns[plane_idx].ofd;
+
+ static struct gtp_packet_desc p;
+ gtp_decode(buf, received, plane_idx, &p);
+
+ if (p.rc <= 0)
+ return -1;
+
+ int rc;
+ rc = gtphub_handle_echo(&p);
+ if (rc == 1) {
+ /* It was en echo. Nothing left to do. */
+ /* (*to_ofd already set above.) */
+ osmo_sockaddr_copy(to_addr, from_addr);
+ return 0;
+ }
+ if (rc < 0)
+ return -1; /* Invalid packet. */
+
+ /* If a GGSN proxy is configured, check that it's indeed that proxy
+ * talking to us. A proxy is a forced 1:1 connection, e.g. to another
+ * gtphub, so no-one else is allowed to talk to us from that side. */
+ struct gtphub_peer_port *ggsn = hub->ggsn_proxy[plane_idx];
+ if (ggsn) {
+ if (osmo_sockaddr_cmp(&ggsn->sa, from_addr) != 0) {
+ LOGERR("Rejecting: GGSN proxy configured, but GTP packet"
+ " received on GGSN bind is from another sender:"
+ " proxy: %s sender: %s\n",
+ gtphub_port_str(ggsn),
+ osmo_sockaddr_to_str(from_addr));
+ return -1;
+ }
+ }
+
+ if (!ggsn) {
+ ggsn = gtphub_port_find_sa(&hub->to_ggsns[plane_idx], from_addr);
+ }
+
+ /* 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. */
+ if (!ggsn) {
+ LOGERR("Invalid GGSN peer. Dropping packet.\n");
+ return -1;
+ }
+
+ LOG("GGSN peer: %s\n", gtphub_port_str(ggsn));
+
+ struct gtphub_peer_port *sgsn_from_seq;
+ struct gtphub_peer_port *sgsn;
+ if (gtphub_unmap(hub, &p, ggsn,
+ hub->sgsn_proxy[plane_idx],
+ &sgsn, &sgsn_from_seq,
+ NULL /* not interested, got it in &sgsn already */
+ )
+ != 0) {
+ return -1;
+ }
+
+ if (!sgsn) {
+ /* A GGSN initiated request would go to a known TEI. So this is
+ * bogus. */
+ LOGERR("No SGSN to send to. Dropping packet.\n");
+ return -1;
+ }
+
+ if (plane_idx == GTPH_PLANE_CTRL) {
+ /* This may be a Create PDP Context response. If it is, there are other
+ * addresses in the GTP message to set up apart from the sender. */
+ if (gtphub_handle_pdp_ctx_ies(hub, hub->to_ggsns,
+ hub->to_sgsns, &p, now)
+ != 0)
+ return -1;
+ }
+
+ gtphub_check_restart_counter(hub, &p, ggsn);
+ gtphub_map_restart_counter(hub, &p, ggsn, sgsn);
+
+ /* 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, now);
+
+ osmo_sockaddr_copy(to_addr, &sgsn->sa);
+ return received;
+}
+
+static int from_sgsns_read_cb(struct osmo_fd *from_sgsns_ofd, unsigned int what)
+{
+ unsigned int plane_idx = from_sgsns_ofd->priv_nr;
+ OSMO_ASSERT(plane_idx < GTPH_PLANE_N);
+ LOG("\n\n=== reading from SGSN (%s)\n", gtphub_plane_idx_names[plane_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, plane_idx, &from_addr, buf, len,
+ gtphub_now(),
+ &to_ofd, &to_addr);
+ if (len < 1)
+ return 0;
+
+ return gtphub_write(to_ofd, &to_addr, buf, len);
+}
+
+/* Analogous to gtphub_from_ggsns_handle_buf(), see the comment there. */
+int gtphub_from_sgsns_handle_buf(struct gtphub *hub,
+ unsigned int plane_idx,
+ const struct osmo_sockaddr *from_addr,
+ uint8_t *buf,
+ size_t received,
+ time_t now,
+ struct osmo_fd **to_ofd,
+ struct osmo_sockaddr *to_addr)
+{
+ LOG("-> rx from SGSN %s\n", osmo_sockaddr_to_str(from_addr));
+
+ *to_ofd = &hub->to_ggsns[plane_idx].ofd;
+
+ static struct gtp_packet_desc p;
+ gtp_decode(buf, received, plane_idx, &p);
+
+ if (p.rc <= 0)
+ return -1;
+
+ int rc;
+ rc = gtphub_handle_echo(&p);
+ if (rc == 1) {
+ /* It was en echo. Nothing left to do. */
+ /* (*to_ofd already set above.) */
+ osmo_sockaddr_copy(to_addr, from_addr);
+ return 0;
+ }
+ if (rc < 0)
+ return -1; /* Invalid packet. */
+
+ /* If an SGSN proxy is configured, check that it's indeed that proxy
+ * talking to us. A proxy is a forced 1:1 connection, e.g. to another
+ * gtphub, so no-one else is allowed to talk to us from that side. */
+ struct gtphub_peer_port *sgsn = hub->sgsn_proxy[plane_idx];
+ if (sgsn) {
+ if (osmo_sockaddr_cmp(&sgsn->sa, from_addr) != 0) {
+ LOGERR("Rejecting: GGSN proxy configured, but GTP packet"
+ " received on GGSN bind is from another sender:"
+ " proxy: %s sender: %s\n",
+ gtphub_port_str(sgsn),
+ osmo_sockaddr_to_str(from_addr));
+ return -1;
+ }
+ }
+
+ if (!sgsn) {
+ /* If any contact has been made before, we already have an
+ * entry for this SGSN. */
+ sgsn = gtphub_port_find_sa(&hub->to_sgsns[plane_idx], from_addr);
+ }
+
+ if (!sgsn) {
+ /* A new peer. If this is on the Ctrl plane, an SGSN may make
+ * first contact without being known yet, so create the peer
+ * struct for the current sender. */
+ if (plane_idx != GTPH_PLANE_CTRL) {
+ LOGERR("User plane peer was not announced by PDP Context, discarding: %s\n",
+ osmo_sockaddr_to_str(from_addr));
+ return -1;
+ }
+
+ struct gsn_addr from_gsna;
+ uint16_t from_port;
+ if (gsn_addr_from_sockaddr(&from_gsna, &from_port, from_addr) != 0)
+ return -1;
+
+ sgsn = gtphub_port_have(hub, &hub->to_sgsns[plane_idx],
+ &from_gsna, from_port);
+ }
+
+ if (!sgsn) {
+ /* This could theoretically happen for invalid address data or somesuch. */
+ LOGERR("Invalid SGSN peer. Dropping packet.\n");
+ return -1;
+ }
+ LOG("SGSN peer: %s\n", gtphub_port_str(sgsn));
+
+ struct gtphub_peer_port *ggsn_from_seq;
+ struct gtphub_peer_port *ggsn;
+ if (gtphub_unmap(hub, &p, sgsn,
+ hub->ggsn_proxy[plane_idx],
+ &ggsn, &ggsn_from_seq,
+ NULL /* not interested, got it in &ggsn already */
+ )
+ != 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_port *ggsn_from_packet;
+ ggsn_from_packet = gtphub_resolve_ggsn(hub, &p);
+
+ if (ggsn_from_packet && ggsn
+ && (ggsn_from_packet != ggsn)) {
+ LOGERR("GGSN implied from packet does not match unmapped"
+ " GGSN, using unmapped GGSN:"
+ " from packet: %s unmapped: %s\n",
+ gtphub_port_str(ggsn_from_packet),
+ gtphub_port_str2(ggsn));
+ /* TODO return -1; ? */
+ }
+
+ if (!ggsn)
+ ggsn = ggsn_from_packet;
+
+ if (!ggsn) {
+ LOGERR("No GGSN to send to. Dropping packet.\n");
+ return -1;
+ }
+
+ if (plane_idx == GTPH_PLANE_CTRL) {
+ /* This may be a Create PDP Context requst. If it is, there are other
+ * addresses in the GTP message to set up apart from the sender. */
+ if (gtphub_handle_pdp_ctx_ies(hub, hub->to_sgsns,
+ hub->to_ggsns, &p, now)
+ != 0)
+ return -1;
+ }
+
+ gtphub_check_restart_counter(hub, &p, sgsn);
+ gtphub_map_restart_counter(hub, &p, sgsn, ggsn);
+
+ /* 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, now);
+
+ osmo_sockaddr_copy(to_addr, &ggsn->sa);
+
+ return received;
+}
+
+static int gtphub_gc_peer_port(struct gtphub_peer_port *pp)
+{
+ return pp->ref_count == 0;
+}
+
+static int gtphub_gc_peer_addr(struct gtphub_peer_addr *pa)
+{
+ struct gtphub_peer_port *pp, *npp;
+ llist_for_each_entry_safe(pp, npp, &pa->ports, entry) {
+ if (gtphub_gc_peer_port(pp)) {
+ LOG("expired: peer %s\n",
+ gtphub_port_str(pp));
+ gtphub_peer_port_del(pp);
+ }
+ }
+ return llist_empty(&pa->ports);
+}
+
+static int gtphub_gc_peer(struct gtphub_peer *p)
+{
+ struct gtphub_peer_addr *pa, *npa;
+ llist_for_each_entry_safe(pa, npa, &p->addresses, entry) {
+ if (gtphub_gc_peer_addr(pa)) {
+ gtphub_peer_addr_del(pa);
+ }
+ }
+
+ /* Note that there's a ref_count in each gtphub_peer_port instance
+ * listed within p->addresses, referenced by TEI mappings from
+ * hub->tei_map. As long as those don't expire, this peer will stay. */
+
+ LOG("gc peer %p llist_empty %d seq_map_empty %d\n", p,
+ (int)llist_empty(&p->addresses), (int) nr_map_empty(&p->seq_map));
+ if (! nr_map_empty(&p->seq_map)) {
+ printf("not empty\n");
+ struct nr_mapping *nrm;
+ llist_for_each_entry(nrm, &p->seq_map.mappings, entry) {
+ printf("%p %s %d -> %d\n",
+ nrm->origin, gtphub_port_str(nrm->origin),nrm->orig, nrm->repl);
+ }
+ }
+ return llist_empty(&p->addresses)
+ && nr_map_empty(&p->seq_map);
+}
+
+static void gtphub_gc_bind(struct gtphub_bind *b)
+{
+ struct gtphub_peer *p, *n;
+ llist_for_each_entry_safe(p, n, &b->peers, entry) {
+ if (gtphub_gc_peer(p)) {
+ gtphub_peer_del(p);
+ }
+ }
+}
+
+void gtphub_gc(struct gtphub *hub, time_t now)
+{
+ int expired;
+ expired = expiry_tick(&hub->expire_seq_maps, now);
+ expired += expiry_tick(&hub->expire_tei_maps, now);
+
+ /* ... */
+
+ if (expired) {
+ int i;
+ for (i = 0; i < GTPH_PLANE_N; i++) {
+ gtphub_gc_bind(&hub->to_sgsns[i]);
+ gtphub_gc_bind(&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);
+
+ expiry_init(&hub->expire_seq_maps, GTPH_SEQ_MAPPING_EXPIRY_SECS);
+ expiry_init(&hub->expire_tei_maps, GTPH_TEI_MAPPING_EXPIRY_MINUTES * 60);
+
+ int plane_idx;
+ for (plane_idx = 0; plane_idx < GTPH_PLANE_N; plane_idx++) {
+ nr_pool_init(&hub->tei_pool[plane_idx]);
+ nr_map_init(&hub->tei_map[plane_idx],
+ &hub->tei_pool[plane_idx],
+ &hub->expire_tei_maps);
+
+ gtphub_bind_init(&hub->to_ggsns[plane_idx]);
+ gtphub_bind_init(&hub->to_sgsns[plane_idx]);
+ }
+}
+
+static int gtphub_make_proxy(struct gtphub *hub,
+ struct gtphub_peer_port **pp,
+ struct gtphub_bind *bind,
+ const struct gtphub_cfg_addr *addr)
+{
+ if (!addr->addr_str)
+ return 0;
+
+ struct gsn_addr gsna;
+ if (gsn_addr_from_str(&gsna, addr->addr_str) != 0)
+ return -1;
+
+ *pp = gtphub_port_have(hub, bind, &gsna, addr->port);
+
+ /* This is *the* proxy. Make sure it is never expired. */
+ gtphub_port_ref_count_inc(*pp);
+ return 0;
+}
+
+int gtphub_start(struct gtphub *hub, struct gtphub_cfg *cfg)
+{
+ int rc;
+
+ gtphub_init(hub);
+
+ int plane_idx;
+ for (plane_idx = 0; plane_idx < GTPH_PLANE_N; plane_idx++) {
+ rc = gtphub_bind_start(&hub->to_ggsns[plane_idx],
+ &cfg->to_ggsns[plane_idx],
+ from_ggsns_read_cb, hub, plane_idx);
+ if (rc) {
+ LOGERR("Failed to bind for GGSNs (%s)\n",
+ gtphub_plane_idx_names[plane_idx]);
+ return rc;
+ }
+
+ rc = gtphub_bind_start(&hub->to_sgsns[plane_idx],
+ &cfg->to_sgsns[plane_idx],
+ from_sgsns_read_cb, hub, plane_idx);
+ if (rc) {
+ LOGERR("Failed to bind for SGSNs (%s)\n",
+ gtphub_plane_idx_names[plane_idx]);
+ return rc;
+ }
+ }
+
+
+ for (plane_idx = 0; plane_idx < GTPH_PLANE_N; plane_idx++) {
+ if (gtphub_make_proxy(hub,
+ &hub->sgsn_proxy[plane_idx],
+ &hub->to_sgsns[plane_idx],
+ &cfg->sgsn_proxy[plane_idx])
+ != 0) {
+ LOGERR("Cannot configure SGSN proxy %s port %d.\n",
+ cfg->sgsn_proxy[plane_idx].addr_str,
+ (int)cfg->sgsn_proxy[plane_idx].port);
+ return -1;
+ }
+ if (gtphub_make_proxy(hub,
+ &hub->ggsn_proxy[plane_idx],
+ &hub->to_ggsns[plane_idx],
+ &cfg->ggsn_proxy[plane_idx])
+ != 0) {
+ LOGERR("Cannot configure GGSN proxy.\n");
+ return -1;
+ }
+ }
+
+ for (plane_idx = 0; plane_idx < GTPH_PLANE_N; plane_idx++) {
+ if (hub->sgsn_proxy[plane_idx])
+ LOG("Using SGSN %s proxy %s\n",
+ gtphub_plane_idx_names[plane_idx],
+ gtphub_port_str(hub->sgsn_proxy[plane_idx]));
+ }
+
+ for (plane_idx = 0; plane_idx < GTPH_PLANE_N; plane_idx++) {
+ if (hub->sgsn_proxy[plane_idx])
+ LOG("Using GGSN %s proxy %s\n",
+ gtphub_plane_idx_names[plane_idx],
+ gtphub_port_str(hub->ggsn_proxy[plane_idx]));
+ }
+
+ gtphub_gc_start(hub);
+ return 0;
+}
+
+static struct gtphub_peer_addr *gtphub_peer_find_addr(const struct gtphub_peer *peer,
+ const struct gsn_addr *addr)
+{
+ struct gtphub_peer_addr *a;
+ llist_for_each_entry(a, &peer->addresses, entry) {
+ if (gsn_addr_same(&a->addr, addr))
+ return a;
+ }
+ return NULL;
+}
+
+static struct gtphub_peer_port *gtphub_addr_find_port(const struct gtphub_peer_addr *a,
+ uint16_t port)
+{
+ OSMO_ASSERT(port);
+ struct gtphub_peer_port *pp;
+ llist_for_each_entry(pp, &a->ports, entry) {
+ if (pp->port == port)
+ return pp;
+ }
+ return NULL;
+}
+
+static struct gtphub_peer_addr *gtphub_addr_find(const struct gtphub_bind *bind,
+ const struct gsn_addr *addr)
+{
+ struct gtphub_peer *peer;
+ llist_for_each_entry(peer, &bind->peers, entry) {
+ struct gtphub_peer_addr *a = gtphub_peer_find_addr(peer, addr);
+ if (a)
+ return a;
+ }
+ return NULL;
+}
+
+static struct gtphub_peer_port *gtphub_port_find(const struct gtphub_bind *bind,
+ const struct gsn_addr *addr,
+ uint16_t port)
+{
+ struct gtphub_peer_addr *a = gtphub_addr_find(bind, addr);
+ if (!a)
+ return NULL;
+ return gtphub_addr_find_port(a, port);
+}
+
+struct gtphub_peer_port *gtphub_port_find_sa(const struct gtphub_bind *bind,
+ const struct osmo_sockaddr *addr)
+{
+ struct gsn_addr gsna;
+ uint16_t port;
+ gsn_addr_from_sockaddr(&gsna, &port, addr);
+ return gtphub_port_find(bind, &gsna, port);
+}
+
+static struct gtphub_peer *gtphub_peer_new(struct gtphub *hub,
+ struct gtphub_bind *bind)
+{
+ struct gtphub_peer *peer = talloc_zero(osmo_gtphub_ctx, struct gtphub_peer);
+ OSMO_ASSERT(peer);
+
+ INIT_LLIST_HEAD(&peer->addresses);
+
+ nr_pool_init(&peer->seq_pool);
+ nr_map_init(&peer->seq_map, &peer->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. */
+ peer->seq_pool.last_nr = 0x6d31 - 1;
+
+ llist_add(&peer->entry, &bind->peers);
+ return peer;
+}
+
+static struct gtphub_peer_addr *gtphub_peer_add_addr(struct gtphub_peer *peer,
+ const struct gsn_addr *addr)
+{
+ struct gtphub_peer_addr *a;
+ a = talloc_zero(osmo_gtphub_ctx, struct gtphub_peer_addr);
+ OSMO_ASSERT(a);
+ a->peer = peer;
+ gsn_addr_copy(&a->addr, addr);
+ INIT_LLIST_HEAD(&a->ports);
+ llist_add(&a->entry, &peer->addresses);
+
+ return a;
+}
+
+static struct gtphub_peer_addr *gtphub_addr_have(struct gtphub *hub,
+ struct gtphub_bind *bind,
+ const struct gsn_addr *addr)
+{
+ struct gtphub_peer_addr *a = gtphub_addr_find(bind, addr);
+ if (a)
+ return a;
+
+ /* If we haven't found an address, that means we need to create an
+ * entirely new peer for the new address. More addresses may be added
+ * to this peer later, but not via this function. */
+ struct gtphub_peer *peer = gtphub_peer_new(hub, bind);
+ return gtphub_peer_add_addr(peer, addr);
+}
+
+static struct gtphub_peer_port *gtphub_addr_add_port(struct gtphub_peer_addr *a,
+ uint16_t port)
+{
+ struct gtphub_peer_port *pp;
+
+ pp = talloc_zero(osmo_gtphub_ctx, struct gtphub_peer_port);
+ OSMO_ASSERT(pp);
+ pp->peer_addr = a;
+ pp->port = port;
+
+ if (gsn_addr_to_sockaddr(&a->addr, port, &pp->sa) != 0) {
+ talloc_free(pp);
+ return NULL;
+ }
+
+ llist_add(&pp->entry, &a->ports);
+
+ LOG("New peer: %s port %d\n",
+ gsn_addr_to_str(&a->addr),
+ (int)port);
+
+ return pp;
+}
+
+static struct gtphub_peer_port *gtphub_port_have(struct gtphub *hub,
+ struct gtphub_bind *bind,
+ const struct gsn_addr *addr,
+ uint16_t port)
+{
+ struct gtphub_peer_addr *a = gtphub_addr_have(hub, bind, addr);
+
+ struct gtphub_peer_port *pp = gtphub_addr_find_port(a, port);
+ if (pp)
+ return pp;
+
+ return gtphub_addr_add_port(a, port);
+}
+
+/* port_override: <=0: use port from addr; >0: use this number as port. Return
+ * NULL if the address cannot be parsed. */
+static struct gtphub_peer_port *gtphub_port_have_sockaddr(struct gtphub *hub,
+ struct gtphub_bind *bind,
+ const struct osmo_sockaddr *addr,
+ int port_override)
+{
+ struct gsn_addr gsna;
+ uint16_t port;
+ if (gsn_addr_from_sockaddr(&gsna, &port, addr) != 0)
+ return NULL;
+
+ if (port_override > 0)
+ port = port_override;
+ return gtphub_port_have(hub, bind, &gsna, port);
+}
+
+static struct gtphub_peer_port *gtphub_have_ggsn(struct gtphub *hub,
+ struct osmo_sockaddr *addr,
+ unsigned int plane_idx,
+ int port_override)
+{
+ if (port_override == 0)
+ port_override = gtphub_plane_idx_default_port[plane_idx];
+
+ return gtphub_port_have_sockaddr(hub, &hub->to_ggsns[plane_idx], addr,
+ port_override);
+}
+
+static struct gtphub_peer_port *gtphub_resolve_ggsn(struct gtphub *hub,
+ struct gtp_packet_desc *p)
+{
+ 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, p->plane_idx, -1);
+}
+
+
+/* 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 == b)
+ return 0;
+ if (!a)
+ return -1;
+ if (!b)
+ return 1;
+ 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;
+}