gtphub: improve handling of restarted peer.
Handle peer restart earlier, so that all the tunnels are deleted by the restart code path, instead of the first one being deleted due to reused TEI. That caused confusing logging messages. Also, when receiving Delete confirmations from the peer that didn't restart, don't complain about unknown peer, but acknowledge and remove the half invalidated tunnel. This means that the pending delete entry from the restart code path is not needed / not used, so don't bother to add pending delete entries upon peer restart. The test test_peer_restarted_reusing_tei() hits the situation where a tunnel is removed because of a reused TEI rather than the restart counter. Adjust the test to expect the "out-of-band" delete request earlier on, and to still see the half invalidated tunnel around. Enhance the test by adding the delete response from the peer that didn't restart, and add a final tunnels_are() verification. Sponsored-by: On-Waves ehi
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@ -1871,14 +1871,6 @@ static void gtphub_restarted(struct gtphub *hub,
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* dropped because the tunnel is rendered unusable. */
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gtphub_send_del_pdp_ctx(hub, tun, other_side_idx(side_idx));
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struct pending_delete *pd;
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pd = pending_delete_new();
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pd->tun = tun;
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pd->teardown_ind = 0xff;
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pd->nsapi = 0;
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llist_add(&pd->entry, &hub->pending_deletes);
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expiry_add(&hub->expire_quickly, &pd->expiry_entry, p->timestamp);
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gtphub_tunnel_endpoint_set_peer(&tun->endpoint[side_idx][GTPH_PLANE_CTRL],
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NULL);
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gtphub_tunnel_endpoint_set_peer(&tun->endpoint[side_idx][GTPH_PLANE_USER],
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@ -2228,6 +2220,9 @@ int gtphub_handle_buf(struct gtphub *hub,
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LOG(LOGL_DEBUG, "from %s peer: %s\n", gtphub_side_idx_names[side_idx],
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gtphub_port_str(from_peer));
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gtphub_check_restart_counter(hub, &p, from_peer);
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gtphub_map_restart_counter(hub, &p);
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struct gtphub_peer_port *to_peer_from_seq;
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struct gtphub_peer_port *to_peer;
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if (gtphub_unmap(hub, &p, from_peer,
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@ -2249,6 +2244,15 @@ int gtphub_handle_buf(struct gtphub *hub,
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return -1;
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}
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if (!to_peer && p.tun && p.type == GTP_DELETE_PDP_RSP) {
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/* It's a delete confirmation for a tunnel that is partly
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* invalid, probably marked unsuable due to a restarted peer.
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* Remove the tunnel and be happy without forwarding. */
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expiring_item_del(&p.tun->expiry_entry);
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p.tun = NULL;
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return 0;
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}
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if (!to_peer) {
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LOG(LOGL_ERROR, "No %s to send to. Dropping packet%s"
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" (type=%" PRIu8 ", header-TEI=%" PRIx32 ", seq=%" PRIx16 ").\n",
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@ -2273,9 +2277,6 @@ int gtphub_handle_buf(struct gtphub *hub,
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* or the tunnel has been deleted due to this message. */
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OSMO_ASSERT(p.tun || (p.type == GTP_DELETE_PDP_RSP));
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gtphub_check_restart_counter(hub, &p, from_peer);
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gtphub_map_restart_counter(hub, &p);
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/* If the GGSN is replying to an SGSN request, the sequence nr has
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* already been unmapped above (to_peer_from_seq != NULL), and we need not
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* create a new mapping. */
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@ -905,9 +905,13 @@ static int msg_from_ggsn(int plane_idx,
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send = gtphub_handle_buf(hub, GTPH_SIDE_GGSN, plane_idx, ggsn_sender,
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buf, msg(msg_from_ggsn), now,
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&reply_buf, &sgsn_ofd, &sgsn_addr);
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LVL2_ASSERT(send > 0);
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LVL2_ASSERT(same_addr(&sgsn_addr, sgsn_receiver));
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LVL2_ASSERT(reply_is(msg_to_sgsn));
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if (*msg_to_sgsn) {
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LVL2_ASSERT(send > 0);
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LVL2_ASSERT(same_addr(&sgsn_addr, sgsn_receiver));
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LVL2_ASSERT(reply_is(msg_to_sgsn));
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}
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else
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LVL2_ASSERT(send == 0);
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return 1;
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}
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@ -1410,7 +1414,8 @@ static void test_peer_restarted_reusing_tei(void)
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);
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const char *gtp_req_to_ggsn =
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MSG_PDP_CTX_REQ("0068",
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"6d32", /* mapped seq ("1234") */
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"6d33", /* seq 6d31 + 2, after "out-of-band" Delete PDP Ctx
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due to differing restart counter. */
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"23",
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"42000121436587f9",
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"00000002", /* mapped TEI Data I ("123") */
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@ -1427,7 +1432,31 @@ static void test_peer_restarted_reusing_tei(void)
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OSMO_ASSERT(was_resolved_for("240010123456789", "internet"));
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OSMO_ASSERT(tunnels_are(
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"TEI=2:"
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"TEI=2:" /* being established after restart */
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" 192.168.42.23 (TEI C=321 U=123)"
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" <-> 192.168.43.34/(uninitialized) (TEI C=0 U=0)"
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" @21955\n"
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"TEI=1:" /* invalidated due to restart */
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" (uninitialized) (TEI C=321 U=123)"
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" <-> 192.168.43.34 (TEI C=765 U=567)"
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" @21945\n"
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));
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/* An "out-of-band" delete request should have been sent to the GGSN
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* (checked by expected log output in gtphub_test.ok), and the GGSN
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* will (usually) send a Delete Response like this: */
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const char *gtp_del_resp_from_ggsn =
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MSG_DEL_PDP_CTX_RSP("00000001", "6d32");
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/* For this response (due to peer restart) we expect no forwarded
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* message. */
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OSMO_ASSERT(msg_from_ggsn_c(&resolved_ggsn_addr,
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&sgsn_sender,
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gtp_del_resp_from_ggsn,
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""));
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OSMO_ASSERT(tunnels_are(
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"TEI=2:" /* still being established after restart */
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" 192.168.42.23 (TEI C=321 U=123)"
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" <-> 192.168.43.34/(uninitialized) (TEI C=0 U=0)"
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" @21955\n"
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@ -1436,7 +1465,7 @@ static void test_peer_restarted_reusing_tei(void)
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const char *gtp_resp_from_ggsn =
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MSG_PDP_CTX_RSP("004e",
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"00000002", /* destination TEI (sent in req above) */
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"6d32", /* mapped seq */
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"6d33", /* mapped seq */
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"01", /* restart */
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"00000def", /* TEI U */
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"00000fde", /* TEI C */
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@ -1446,7 +1475,7 @@ static void test_peer_restarted_reusing_tei(void)
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const char *gtp_resp_to_sgsn =
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MSG_PDP_CTX_RSP("004e",
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"00000321", /* unmapped TEI ("005") */
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"1234", /* unmapped seq ("6d32") */
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"1234", /* unmapped seq ("6d33") */
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"23",
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"00000002", /* mapped TEI from GGSN ("567") */
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"00000002", /* mapped TEI from GGSN ("765") */
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@ -1460,6 +1489,13 @@ static void test_peer_restarted_reusing_tei(void)
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gtp_resp_from_ggsn,
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gtp_resp_to_sgsn));
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OSMO_ASSERT(tunnels_are(
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"TEI=2:" /* still being established after restart */
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" 192.168.42.23 (TEI C=321 U=123)"
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" <-> 192.168.43.34 (TEI C=fde U=def)"
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" @21955\n"
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));
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OSMO_ASSERT(clear_test_hub());
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}
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@ -17,14 +17,17 @@ test_reused_tei
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test_peer_restarted
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- __wrap_gtphub_resolve_ggsn_addr():
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returning GGSN addr from imsi 240010123456789 ni internet: 192.168.43.34 port 2123
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Out-of-band gtphub_write(16):
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to 192.168.43.34 port 2123
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32 14 00 08 00 00 07 65 6d 32 00 00 13 ff 14 00
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- __wrap_gtphub_resolve_ggsn_addr():
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returning GGSN addr from imsi 240010123456789 ni internet: 192.168.43.34 port 2123
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test_peer_restarted_reusing_tei
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- __wrap_gtphub_resolve_ggsn_addr():
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returning GGSN addr from imsi 240010123456789 ni internet: 192.168.43.34 port 2123
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Out-of-band gtphub_write(16):
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to 192.168.43.34 port 2123
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32 14 00 08 00 00 07 65 6d 32 00 00 13 ff 14 00
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test_peer_restarted_reusing_tei
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- __wrap_gtphub_resolve_ggsn_addr():
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returning GGSN addr from imsi 240010123456789 ni internet: 192.168.43.34 port 2123
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- __wrap_gtphub_resolve_ggsn_addr():
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returning GGSN addr from imsi 240010123456789 ni internet: 192.168.43.34 port 2123
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test_user_data
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