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-rw-r--r--src/openvpn/occ.c634
1 files changed, 335 insertions, 299 deletions
diff --git a/src/openvpn/occ.c b/src/openvpn/occ.c
index d71381d..b4ccc4d 100644
--- a/src/openvpn/occ.c
+++ b/src/openvpn/occ.c
@@ -5,7 +5,7 @@
* packet encryption, packet authentication, and
* packet compression.
*
- * Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
+ * Copyright (C) 2002-2017 OpenVPN Technologies, Inc. <sales@openvpn.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
@@ -60,340 +60,376 @@
*/
const uint8_t occ_magic[] = {
- 0x28, 0x7f, 0x34, 0x6b, 0xd4, 0xef, 0x7a, 0x81,
- 0x2d, 0x56, 0xb8, 0xd3, 0xaf, 0xc5, 0x45, 0x9c
+ 0x28, 0x7f, 0x34, 0x6b, 0xd4, 0xef, 0x7a, 0x81,
+ 0x2d, 0x56, 0xb8, 0xd3, 0xaf, 0xc5, 0x45, 0x9c
};
static const struct mtu_load_test mtu_load_test_sequence[] = {
- {OCC_MTU_LOAD_REQUEST, -1000},
- {OCC_MTU_LOAD, -1000},
- {OCC_MTU_LOAD_REQUEST, -1000},
- {OCC_MTU_LOAD, -1000},
- {OCC_MTU_LOAD_REQUEST, -1000},
- {OCC_MTU_LOAD, -1000},
-
- {OCC_MTU_LOAD_REQUEST, -750},
- {OCC_MTU_LOAD, -750},
- {OCC_MTU_LOAD_REQUEST, -750},
- {OCC_MTU_LOAD, -750},
- {OCC_MTU_LOAD_REQUEST, -750},
- {OCC_MTU_LOAD, -750},
-
- {OCC_MTU_LOAD_REQUEST, -500},
- {OCC_MTU_LOAD, -500},
- {OCC_MTU_LOAD_REQUEST, -500},
- {OCC_MTU_LOAD, -500},
- {OCC_MTU_LOAD_REQUEST, -500},
- {OCC_MTU_LOAD, -500},
-
- {OCC_MTU_LOAD_REQUEST, -400},
- {OCC_MTU_LOAD, -400},
- {OCC_MTU_LOAD_REQUEST, -400},
- {OCC_MTU_LOAD, -400},
- {OCC_MTU_LOAD_REQUEST, -400},
- {OCC_MTU_LOAD, -400},
-
- {OCC_MTU_LOAD_REQUEST, -300},
- {OCC_MTU_LOAD, -300},
- {OCC_MTU_LOAD_REQUEST, -300},
- {OCC_MTU_LOAD, -300},
- {OCC_MTU_LOAD_REQUEST, -300},
- {OCC_MTU_LOAD, -300},
-
- {OCC_MTU_LOAD_REQUEST, -200},
- {OCC_MTU_LOAD, -200},
- {OCC_MTU_LOAD_REQUEST, -200},
- {OCC_MTU_LOAD, -200},
- {OCC_MTU_LOAD_REQUEST, -200},
- {OCC_MTU_LOAD, -200},
-
- {OCC_MTU_LOAD_REQUEST, -150},
- {OCC_MTU_LOAD, -150},
- {OCC_MTU_LOAD_REQUEST, -150},
- {OCC_MTU_LOAD, -150},
- {OCC_MTU_LOAD_REQUEST, -150},
- {OCC_MTU_LOAD, -150},
-
- {OCC_MTU_LOAD_REQUEST, -100},
- {OCC_MTU_LOAD, -100},
- {OCC_MTU_LOAD_REQUEST, -100},
- {OCC_MTU_LOAD, -100},
- {OCC_MTU_LOAD_REQUEST, -100},
- {OCC_MTU_LOAD, -100},
-
- {OCC_MTU_LOAD_REQUEST, -50},
- {OCC_MTU_LOAD, -50},
- {OCC_MTU_LOAD_REQUEST, -50},
- {OCC_MTU_LOAD, -50},
- {OCC_MTU_LOAD_REQUEST, -50},
- {OCC_MTU_LOAD, -50},
-
- {OCC_MTU_LOAD_REQUEST, 0},
- {OCC_MTU_LOAD, 0},
- {OCC_MTU_LOAD_REQUEST, 0},
- {OCC_MTU_LOAD, 0},
- {OCC_MTU_LOAD_REQUEST, 0},
- {OCC_MTU_LOAD, 0},
-
- {OCC_MTU_REQUEST, 0},
- {OCC_MTU_REQUEST, 0},
- {OCC_MTU_REQUEST, 0},
- {OCC_MTU_REQUEST, 0},
- {OCC_MTU_REQUEST, 0},
- {OCC_MTU_REQUEST, 0},
- {OCC_MTU_REQUEST, 0},
- {OCC_MTU_REQUEST, 0},
- {OCC_MTU_REQUEST, 0},
- {OCC_MTU_REQUEST, 0},
-
- {-1, 0}
+ {OCC_MTU_LOAD_REQUEST, -1000},
+ {OCC_MTU_LOAD, -1000},
+ {OCC_MTU_LOAD_REQUEST, -1000},
+ {OCC_MTU_LOAD, -1000},
+ {OCC_MTU_LOAD_REQUEST, -1000},
+ {OCC_MTU_LOAD, -1000},
+
+ {OCC_MTU_LOAD_REQUEST, -750},
+ {OCC_MTU_LOAD, -750},
+ {OCC_MTU_LOAD_REQUEST, -750},
+ {OCC_MTU_LOAD, -750},
+ {OCC_MTU_LOAD_REQUEST, -750},
+ {OCC_MTU_LOAD, -750},
+
+ {OCC_MTU_LOAD_REQUEST, -500},
+ {OCC_MTU_LOAD, -500},
+ {OCC_MTU_LOAD_REQUEST, -500},
+ {OCC_MTU_LOAD, -500},
+ {OCC_MTU_LOAD_REQUEST, -500},
+ {OCC_MTU_LOAD, -500},
+
+ {OCC_MTU_LOAD_REQUEST, -400},
+ {OCC_MTU_LOAD, -400},
+ {OCC_MTU_LOAD_REQUEST, -400},
+ {OCC_MTU_LOAD, -400},
+ {OCC_MTU_LOAD_REQUEST, -400},
+ {OCC_MTU_LOAD, -400},
+
+ {OCC_MTU_LOAD_REQUEST, -300},
+ {OCC_MTU_LOAD, -300},
+ {OCC_MTU_LOAD_REQUEST, -300},
+ {OCC_MTU_LOAD, -300},
+ {OCC_MTU_LOAD_REQUEST, -300},
+ {OCC_MTU_LOAD, -300},
+
+ {OCC_MTU_LOAD_REQUEST, -200},
+ {OCC_MTU_LOAD, -200},
+ {OCC_MTU_LOAD_REQUEST, -200},
+ {OCC_MTU_LOAD, -200},
+ {OCC_MTU_LOAD_REQUEST, -200},
+ {OCC_MTU_LOAD, -200},
+
+ {OCC_MTU_LOAD_REQUEST, -150},
+ {OCC_MTU_LOAD, -150},
+ {OCC_MTU_LOAD_REQUEST, -150},
+ {OCC_MTU_LOAD, -150},
+ {OCC_MTU_LOAD_REQUEST, -150},
+ {OCC_MTU_LOAD, -150},
+
+ {OCC_MTU_LOAD_REQUEST, -100},
+ {OCC_MTU_LOAD, -100},
+ {OCC_MTU_LOAD_REQUEST, -100},
+ {OCC_MTU_LOAD, -100},
+ {OCC_MTU_LOAD_REQUEST, -100},
+ {OCC_MTU_LOAD, -100},
+
+ {OCC_MTU_LOAD_REQUEST, -50},
+ {OCC_MTU_LOAD, -50},
+ {OCC_MTU_LOAD_REQUEST, -50},
+ {OCC_MTU_LOAD, -50},
+ {OCC_MTU_LOAD_REQUEST, -50},
+ {OCC_MTU_LOAD, -50},
+
+ {OCC_MTU_LOAD_REQUEST, 0},
+ {OCC_MTU_LOAD, 0},
+ {OCC_MTU_LOAD_REQUEST, 0},
+ {OCC_MTU_LOAD, 0},
+ {OCC_MTU_LOAD_REQUEST, 0},
+ {OCC_MTU_LOAD, 0},
+
+ {OCC_MTU_REQUEST, 0},
+ {OCC_MTU_REQUEST, 0},
+ {OCC_MTU_REQUEST, 0},
+ {OCC_MTU_REQUEST, 0},
+ {OCC_MTU_REQUEST, 0},
+ {OCC_MTU_REQUEST, 0},
+ {OCC_MTU_REQUEST, 0},
+ {OCC_MTU_REQUEST, 0},
+ {OCC_MTU_REQUEST, 0},
+ {OCC_MTU_REQUEST, 0},
+
+ {-1, 0}
};
void
-check_send_occ_req_dowork (struct context *c)
+check_send_occ_req_dowork(struct context *c)
{
- if (++c->c2.occ_n_tries >= OCC_N_TRIES)
+ if (++c->c2.occ_n_tries >= OCC_N_TRIES)
{
- if (c->options.ce.remote)
- /*
- * No OCC_REPLY from peer after repeated attempts.
- * Give up.
- */
- msg (D_SHOW_OCC,
- "NOTE: failed to obtain options consistency info from peer -- "
- "this could occur if the remote peer is running a version of "
- PACKAGE_NAME
- " before 1.5-beta8 or if there is a network connectivity problem, and will not necessarily prevent "
- PACKAGE_NAME
- " from running (" counter_format " bytes received from peer, " counter_format
- " bytes authenticated data channel traffic) -- you can disable the options consistency "
- "check with --disable-occ.",
- c->c2.link_read_bytes,
- c->c2.link_read_bytes_auth);
- event_timeout_clear (&c->c2.occ_interval);
+ if (c->options.ce.remote)
+ {
+ /*
+ * No OCC_REPLY from peer after repeated attempts.
+ * Give up.
+ */
+ msg(D_SHOW_OCC,
+ "NOTE: failed to obtain options consistency info from peer -- "
+ "this could occur if the remote peer is running a version of "
+ PACKAGE_NAME
+ " before 1.5-beta8 or if there is a network connectivity problem, and will not necessarily prevent "
+ PACKAGE_NAME
+ " from running (" counter_format " bytes received from peer, " counter_format
+ " bytes authenticated data channel traffic) -- you can disable the options consistency "
+ "check with --disable-occ.",
+ c->c2.link_read_bytes,
+ c->c2.link_read_bytes_auth);
+ }
+ event_timeout_clear(&c->c2.occ_interval);
}
- else
+ else
{
- c->c2.occ_op = OCC_REQUEST;
+ c->c2.occ_op = OCC_REQUEST;
- /*
- * If we don't hear back from peer, send another
- * OCC_REQUEST in OCC_INTERVAL_SECONDS.
- */
- event_timeout_reset (&c->c2.occ_interval);
+ /*
+ * If we don't hear back from peer, send another
+ * OCC_REQUEST in OCC_INTERVAL_SECONDS.
+ */
+ event_timeout_reset(&c->c2.occ_interval);
}
}
void
-check_send_occ_load_test_dowork (struct context *c)
+check_send_occ_load_test_dowork(struct context *c)
{
- if (CONNECTION_ESTABLISHED (c))
+ if (CONNECTION_ESTABLISHED(c))
{
- const struct mtu_load_test *entry;
-
- if (!c->c2.occ_mtu_load_n_tries)
- msg (M_INFO,
- "NOTE: Beginning empirical MTU test -- results should be available in 3 to 4 minutes.");
-
- entry = &mtu_load_test_sequence[c->c2.occ_mtu_load_n_tries++];
- if (entry->op >= 0)
- {
- c->c2.occ_op = entry->op;
- c->c2.occ_mtu_load_size =
- EXPANDED_SIZE (&c->c2.frame) + entry->delta;
- }
- else
- {
- msg (M_INFO,
- "NOTE: failed to empirically measure MTU (requires " PACKAGE_NAME " 1.5 or higher at other end of connection).");
- event_timeout_clear (&c->c2.occ_mtu_load_test_interval);
- c->c2.occ_mtu_load_n_tries = 0;
- }
+ const struct mtu_load_test *entry;
+
+ if (!c->c2.occ_mtu_load_n_tries)
+ {
+ msg(M_INFO,
+ "NOTE: Beginning empirical MTU test -- results should be available in 3 to 4 minutes.");
+ }
+
+ entry = &mtu_load_test_sequence[c->c2.occ_mtu_load_n_tries++];
+ if (entry->op >= 0)
+ {
+ c->c2.occ_op = entry->op;
+ c->c2.occ_mtu_load_size =
+ EXPANDED_SIZE(&c->c2.frame) + entry->delta;
+ }
+ else
+ {
+ msg(M_INFO,
+ "NOTE: failed to empirically measure MTU (requires " PACKAGE_NAME " 1.5 or higher at other end of connection).");
+ event_timeout_clear(&c->c2.occ_mtu_load_test_interval);
+ c->c2.occ_mtu_load_n_tries = 0;
+ }
}
}
void
-check_send_occ_msg_dowork (struct context *c)
+check_send_occ_msg_dowork(struct context *c)
{
- bool doit = false;
+ bool doit = false;
- c->c2.buf = c->c2.buffers->aux_buf;
- ASSERT (buf_init (&c->c2.buf, FRAME_HEADROOM (&c->c2.frame)));
- ASSERT (buf_safe (&c->c2.buf, MAX_RW_SIZE_TUN (&c->c2.frame)));
- ASSERT (buf_write (&c->c2.buf, occ_magic, OCC_STRING_SIZE));
+ c->c2.buf = c->c2.buffers->aux_buf;
+ ASSERT(buf_init(&c->c2.buf, FRAME_HEADROOM(&c->c2.frame)));
+ ASSERT(buf_safe(&c->c2.buf, MAX_RW_SIZE_TUN(&c->c2.frame)));
+ ASSERT(buf_write(&c->c2.buf, occ_magic, OCC_STRING_SIZE));
- switch (c->c2.occ_op)
+ switch (c->c2.occ_op)
{
- case OCC_REQUEST:
- if (!buf_write_u8 (&c->c2.buf, OCC_REQUEST))
- break;
- dmsg (D_PACKET_CONTENT, "SENT OCC_REQUEST");
- doit = true;
- break;
-
- case OCC_REPLY:
- if (!c->c2.options_string_local)
- break;
- if (!buf_write_u8 (&c->c2.buf, OCC_REPLY))
- break;
- if (!buf_write (&c->c2.buf, c->c2.options_string_local,
- strlen (c->c2.options_string_local) + 1))
- break;
- dmsg (D_PACKET_CONTENT, "SENT OCC_REPLY");
- doit = true;
- break;
-
- case OCC_MTU_REQUEST:
- if (!buf_write_u8 (&c->c2.buf, OCC_MTU_REQUEST))
- break;
- dmsg (D_PACKET_CONTENT, "SENT OCC_MTU_REQUEST");
- doit = true;
- break;
-
- case OCC_MTU_REPLY:
- if (!buf_write_u8 (&c->c2.buf, OCC_MTU_REPLY))
- break;
- if (!buf_write_u16 (&c->c2.buf, c->c2.max_recv_size_local))
- break;
- if (!buf_write_u16 (&c->c2.buf, c->c2.max_send_size_local))
- break;
- dmsg (D_PACKET_CONTENT, "SENT OCC_MTU_REPLY");
- doit = true;
- break;
-
- case OCC_MTU_LOAD_REQUEST:
- if (!buf_write_u8 (&c->c2.buf, OCC_MTU_LOAD_REQUEST))
- break;
- if (!buf_write_u16 (&c->c2.buf, c->c2.occ_mtu_load_size))
- break;
- dmsg (D_PACKET_CONTENT, "SENT OCC_MTU_LOAD_REQUEST");
- doit = true;
- break;
-
- case OCC_MTU_LOAD:
- {
- int need_to_add;
-
- if (!buf_write_u8 (&c->c2.buf, OCC_MTU_LOAD))
- break;
- need_to_add = min_int (c->c2.occ_mtu_load_size, EXPANDED_SIZE (&c->c2.frame))
- - OCC_STRING_SIZE
- - sizeof (uint8_t)
- - EXTRA_FRAME (&c->c2.frame);
-
- while (need_to_add > 0)
- {
- /*
- * Fill the load test packet with pseudo-random bytes.
- */
- if (!buf_write_u8 (&c->c2.buf, get_random () & 0xFF))
- break;
- --need_to_add;
- }
- dmsg (D_PACKET_CONTENT, "SENT OCC_MTU_LOAD min_int(%d-%d-%d-%d,%d) size=%d",
- c->c2.occ_mtu_load_size,
- OCC_STRING_SIZE,
- (int) sizeof (uint8_t),
- EXTRA_FRAME (&c->c2.frame),
- MAX_RW_SIZE_TUN (&c->c2.frame),
- BLEN (&c->c2.buf));
- doit = true;
- }
- break;
-
- case OCC_EXIT:
- if (!buf_write_u8 (&c->c2.buf, OCC_EXIT))
- break;
- dmsg (D_PACKET_CONTENT, "SENT OCC_EXIT");
- doit = true;
- break;
+ case OCC_REQUEST:
+ if (!buf_write_u8(&c->c2.buf, OCC_REQUEST))
+ {
+ break;
+ }
+ dmsg(D_PACKET_CONTENT, "SENT OCC_REQUEST");
+ doit = true;
+ break;
+
+ case OCC_REPLY:
+ if (!c->c2.options_string_local)
+ {
+ break;
+ }
+ if (!buf_write_u8(&c->c2.buf, OCC_REPLY))
+ {
+ break;
+ }
+ if (!buf_write(&c->c2.buf, c->c2.options_string_local,
+ strlen(c->c2.options_string_local) + 1))
+ {
+ break;
+ }
+ dmsg(D_PACKET_CONTENT, "SENT OCC_REPLY");
+ doit = true;
+ break;
+
+ case OCC_MTU_REQUEST:
+ if (!buf_write_u8(&c->c2.buf, OCC_MTU_REQUEST))
+ {
+ break;
+ }
+ dmsg(D_PACKET_CONTENT, "SENT OCC_MTU_REQUEST");
+ doit = true;
+ break;
+
+ case OCC_MTU_REPLY:
+ if (!buf_write_u8(&c->c2.buf, OCC_MTU_REPLY))
+ {
+ break;
+ }
+ if (!buf_write_u16(&c->c2.buf, c->c2.max_recv_size_local))
+ {
+ break;
+ }
+ if (!buf_write_u16(&c->c2.buf, c->c2.max_send_size_local))
+ {
+ break;
+ }
+ dmsg(D_PACKET_CONTENT, "SENT OCC_MTU_REPLY");
+ doit = true;
+ break;
+
+ case OCC_MTU_LOAD_REQUEST:
+ if (!buf_write_u8(&c->c2.buf, OCC_MTU_LOAD_REQUEST))
+ {
+ break;
+ }
+ if (!buf_write_u16(&c->c2.buf, c->c2.occ_mtu_load_size))
+ {
+ break;
+ }
+ dmsg(D_PACKET_CONTENT, "SENT OCC_MTU_LOAD_REQUEST");
+ doit = true;
+ break;
+
+ case OCC_MTU_LOAD:
+ {
+ int need_to_add;
+
+ if (!buf_write_u8(&c->c2.buf, OCC_MTU_LOAD))
+ {
+ break;
+ }
+ need_to_add = min_int(c->c2.occ_mtu_load_size, EXPANDED_SIZE(&c->c2.frame))
+ - OCC_STRING_SIZE
+ - sizeof(uint8_t)
+ - EXTRA_FRAME(&c->c2.frame);
+
+ while (need_to_add > 0)
+ {
+ /*
+ * Fill the load test packet with pseudo-random bytes.
+ */
+ if (!buf_write_u8(&c->c2.buf, get_random() & 0xFF))
+ {
+ break;
+ }
+ --need_to_add;
+ }
+ dmsg(D_PACKET_CONTENT, "SENT OCC_MTU_LOAD min_int(%d-%d-%d-%d,%d) size=%d",
+ c->c2.occ_mtu_load_size,
+ OCC_STRING_SIZE,
+ (int) sizeof(uint8_t),
+ EXTRA_FRAME(&c->c2.frame),
+ MAX_RW_SIZE_TUN(&c->c2.frame),
+ BLEN(&c->c2.buf));
+ doit = true;
+ }
+ break;
+
+ case OCC_EXIT:
+ if (!buf_write_u8(&c->c2.buf, OCC_EXIT))
+ {
+ break;
+ }
+ dmsg(D_PACKET_CONTENT, "SENT OCC_EXIT");
+ doit = true;
+ break;
}
- if (doit)
+ if (doit)
{
- /*
- * We will treat the packet like any other outgoing packet,
- * compress, encrypt, sign, etc.
- */
- encrypt_sign (c, true);
+ /*
+ * We will treat the packet like any other outgoing packet,
+ * compress, encrypt, sign, etc.
+ */
+ encrypt_sign(c, true);
}
- c->c2.occ_op = -1;
+ c->c2.occ_op = -1;
}
void
-process_received_occ_msg (struct context *c)
+process_received_occ_msg(struct context *c)
{
- ASSERT (buf_advance (&c->c2.buf, OCC_STRING_SIZE));
- switch (buf_read_u8 (&c->c2.buf))
+ ASSERT(buf_advance(&c->c2.buf, OCC_STRING_SIZE));
+ switch (buf_read_u8(&c->c2.buf))
{
- case OCC_REQUEST:
- dmsg (D_PACKET_CONTENT, "RECEIVED OCC_REQUEST");
- c->c2.occ_op = OCC_REPLY;
- break;
-
- case OCC_MTU_REQUEST:
- dmsg (D_PACKET_CONTENT, "RECEIVED OCC_MTU_REQUEST");
- c->c2.occ_op = OCC_MTU_REPLY;
- break;
-
- case OCC_MTU_LOAD_REQUEST:
- dmsg (D_PACKET_CONTENT, "RECEIVED OCC_MTU_LOAD_REQUEST");
- c->c2.occ_mtu_load_size = buf_read_u16 (&c->c2.buf);
- if (c->c2.occ_mtu_load_size >= 0)
- c->c2.occ_op = OCC_MTU_LOAD;
- break;
-
- case OCC_REPLY:
- dmsg (D_PACKET_CONTENT, "RECEIVED OCC_REPLY");
- if (c->options.occ && !TLS_MODE (c) && c->c2.options_string_remote)
- {
- if (!options_cmp_equal_safe ((char *) BPTR (&c->c2.buf),
- c->c2.options_string_remote,
- c->c2.buf.len))
- {
- options_warning_safe ((char *) BPTR (&c->c2.buf),
- c->c2.options_string_remote,
- c->c2.buf.len);
- }
- }
- event_timeout_clear (&c->c2.occ_interval);
- break;
-
- case OCC_MTU_REPLY:
- dmsg (D_PACKET_CONTENT, "RECEIVED OCC_MTU_REPLY");
- c->c2.max_recv_size_remote = buf_read_u16 (&c->c2.buf);
- c->c2.max_send_size_remote = buf_read_u16 (&c->c2.buf);
- if (c->options.mtu_test
- && c->c2.max_recv_size_remote > 0
- && c->c2.max_send_size_remote > 0)
- {
- msg (M_INFO, "NOTE: Empirical MTU test completed [Tried,Actual] local->remote=[%d,%d] remote->local=[%d,%d]",
- c->c2.max_send_size_local,
- c->c2.max_recv_size_remote,
- c->c2.max_send_size_remote,
- c->c2.max_recv_size_local);
- if (!c->options.ce.fragment
- && (proto_is_dgram(c->options.ce.proto))
- && c->c2.max_send_size_local > TUN_MTU_MIN
- && (c->c2.max_recv_size_remote < c->c2.max_send_size_local
- || c->c2.max_recv_size_local < c->c2.max_send_size_remote))
- msg (M_INFO, "NOTE: This connection is unable to accommodate a UDP packet size of %d. Consider using --fragment or --mssfix options as a workaround.",
- c->c2.max_send_size_local);
- }
- event_timeout_clear (&c->c2.occ_mtu_load_test_interval);
- break;
-
- case OCC_EXIT:
- dmsg (D_PACKET_CONTENT, "RECEIVED OCC_EXIT");
- c->sig->signal_received = SIGTERM;
- c->sig->signal_text = "remote-exit";
- break;
+ case OCC_REQUEST:
+ dmsg(D_PACKET_CONTENT, "RECEIVED OCC_REQUEST");
+ c->c2.occ_op = OCC_REPLY;
+ break;
+
+ case OCC_MTU_REQUEST:
+ dmsg(D_PACKET_CONTENT, "RECEIVED OCC_MTU_REQUEST");
+ c->c2.occ_op = OCC_MTU_REPLY;
+ break;
+
+ case OCC_MTU_LOAD_REQUEST:
+ dmsg(D_PACKET_CONTENT, "RECEIVED OCC_MTU_LOAD_REQUEST");
+ c->c2.occ_mtu_load_size = buf_read_u16(&c->c2.buf);
+ if (c->c2.occ_mtu_load_size >= 0)
+ {
+ c->c2.occ_op = OCC_MTU_LOAD;
+ }
+ break;
+
+ case OCC_REPLY:
+ dmsg(D_PACKET_CONTENT, "RECEIVED OCC_REPLY");
+ if (c->options.occ && !TLS_MODE(c) && c->c2.options_string_remote)
+ {
+ if (!options_cmp_equal_safe((char *) BPTR(&c->c2.buf),
+ c->c2.options_string_remote,
+ c->c2.buf.len))
+ {
+ options_warning_safe((char *) BPTR(&c->c2.buf),
+ c->c2.options_string_remote,
+ c->c2.buf.len);
+ }
+ }
+ event_timeout_clear(&c->c2.occ_interval);
+ break;
+
+ case OCC_MTU_REPLY:
+ dmsg(D_PACKET_CONTENT, "RECEIVED OCC_MTU_REPLY");
+ c->c2.max_recv_size_remote = buf_read_u16(&c->c2.buf);
+ c->c2.max_send_size_remote = buf_read_u16(&c->c2.buf);
+ if (c->options.mtu_test
+ && c->c2.max_recv_size_remote > 0
+ && c->c2.max_send_size_remote > 0)
+ {
+ msg(M_INFO, "NOTE: Empirical MTU test completed [Tried,Actual] local->remote=[%d,%d] remote->local=[%d,%d]",
+ c->c2.max_send_size_local,
+ c->c2.max_recv_size_remote,
+ c->c2.max_send_size_remote,
+ c->c2.max_recv_size_local);
+ if (!c->options.ce.fragment
+ && (proto_is_dgram(c->options.ce.proto))
+ && c->c2.max_send_size_local > TUN_MTU_MIN
+ && (c->c2.max_recv_size_remote < c->c2.max_send_size_local
+ || c->c2.max_recv_size_local < c->c2.max_send_size_remote))
+ {
+ msg(M_INFO, "NOTE: This connection is unable to accommodate a UDP packet size of %d. Consider using --fragment or --mssfix options as a workaround.",
+ c->c2.max_send_size_local);
+ }
+ }
+ event_timeout_clear(&c->c2.occ_mtu_load_test_interval);
+ break;
+
+ case OCC_EXIT:
+ dmsg(D_PACKET_CONTENT, "RECEIVED OCC_EXIT");
+ c->sig->signal_received = SIGTERM;
+ c->sig->signal_text = "remote-exit";
+ break;
}
- c->c2.buf.len = 0; /* don't pass packet on */
+ c->c2.buf.len = 0; /* don't pass packet on */
}
-#else
-static void dummy(void) {}
-#endif
+#else /* ifdef ENABLE_OCC */
+static void
+dummy(void) {
+}
+#endif /* ifdef ENABLE_OCC */
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-10 17:07:31 +0000