Commit graph

1608 commits

Author SHA1 Message Date
Guus Sliepen
74653beb5b Mark Forwarding and DirectOnly options as being experimental. 2010-04-11 19:47:44 +02:00
Guus Sliepen
0ddce6370d Don't redefine MAX if it already exists. 2010-04-11 19:39:31 +02:00
Guus Sliepen
a9bbb3357a Fixes for definitions under Windows. 2010-04-11 19:20:02 +02:00
Guus Sliepen
4708f2c89e Ensure subnet-up/down scripts are called after HUP when necessary. 2010-04-11 18:34:50 +02:00
Guus Sliepen
32f5524c4b Fix reloading Subnets when StrictSubnets is set. 2010-04-11 04:35:16 +02:00
Guus Sliepen
9f53ab209d Reload Subnets when getting a HUP signal and StrictSubnets is used. 2010-04-11 00:50:42 +02:00
Guus Sliepen
d1cc637470 Ensure ICMP_NET_ANO is defined. 2010-04-10 23:55:15 +02:00
Guus Sliepen
f75e71bc69 Convert Port to numeric form before sending it to other nodes.
If one uses a symbolic name for the Port option, tinc will send that name
literally to other nodes.  However, it is not guaranteed that all nodes have
the same contents in /etc/services, or have such a file at all.
2010-04-03 09:46:45 +01:00
Sven-Haegar Koch
292354912f Never delete Subnets when StrictSubnets is set
If a node is unreachable, and not connected to an edge anymore, it gets
deleted. When this happens its subnets are also removed, which should
not happen with StrictSubnets=yes.

Solution:
- do not remove subnets in src/net.c::purge(), we know that all subnets
  in the list came from our hosts files.
  I think here you got the check wrong by looking at the tunnelserver
  code below it - with strictsubnets we still inform others but do not
  remove the subnet from our data.
- do not remove nodes in net.c::purge() that still have subnets
  attached.
2010-03-18 11:50:45 +01:00
Guus Sliepen
146760bd35 Fix typo. 2010-03-10 16:07:01 +01:00
Guus Sliepen
f2346771cf Log unauthorized Subnets when StrictSubnets is set. 2010-03-08 21:44:32 +01:00
Guus Sliepen
ee64b8ef33 ConnectTo does not mean tinc does not listen for incoming connections anymore. 2010-03-08 17:54:57 +01:00
Guus Sliepen
8ae54dc7c7 Fixes for the Forwarding option. 2010-03-02 23:27:50 +01:00
Guus Sliepen
3e4829e78a Add the DirectOnly option.
When this option is enabled, packets that cannot be sent directly to the destination node,
but which would have to be forwarded by an intermediate node, are dropped instead.
When combined with the IndirectData option,
packets for nodes for which we do not have a meta connection with are also dropped.
2010-03-02 22:55:24 +01:00
Guus Sliepen
95a6974de1 Add the Forwarding option.
This determines if and how incoming packets that are not meant for the local
node are forwarded.  It can either be off, internal (tinc forwards them itself,
as in previous versions), or kernel (packets are always sent to the TUN/TAP
device, letting the kernel sort them out).
2010-03-02 22:34:26 +01:00
Guus Sliepen
5038964032 Add the StrictSubnets option.
When this option is enabled, tinc will not accept dynamic updates of Subnets
from other nodes, but will only use Subnets read from local host config files
to build its routing table.
2010-03-02 00:18:44 +01:00
Guus Sliepen
9fed0ec34b Preload all Subnets in TunnelServer mode.
This simplifies the logic in protocol_subnet.c.
2010-03-01 23:44:56 +01:00
Guus Sliepen
d47ab576a2 Check for dirent.h. 2010-03-01 23:44:46 +01:00
Guus Sliepen
21f33b6382 Simplify reading lines from configuration files.
Instead of allocating storage for each line read, we now read into fixed-size
buffers on the stack. This fixes a case where a malformed configuration file
could crash tinc.
2010-03-01 23:35:02 +01:00
Guus Sliepen
3cb91d75f8 Clamp MSS to miminum MTU in both directions.
Clamp MSS of both incoming and outgoing packets, and use the minimum of the
PMTU of both directions when clamping.
2010-02-28 18:20:13 +01:00
Timothy Redaelli
ddb8cb0779 Add --disable-zlib configure option 2010-02-10 16:47:52 +01:00
Timothy Redaelli
eeb505af36 Add --disable-lzo configure option 2010-02-10 16:47:52 +01:00
Guus Sliepen
f7b2a2ea43 Releasing 1.0.12. 2010-02-03 22:49:48 +01:00
Guus Sliepen
cd0c2e86a4 Ensure peers with a meta connection always have our key.
This keeps UDP probes going, which in turn keeps NAT mappings alive.
2010-02-03 11:18:46 +01:00
Guus Sliepen
40d91ff619 Update copyright notices. 2010-02-02 22:49:21 +01:00
Guus Sliepen
44f8f61396 Try to set DF bit on BSDs as well.
Every operating system seems to have its own, slightly different way to disable
packet fragmentation. Emit a compiler warning when no suitable way is found.
On OpenBSD, it seems impossible to do it for IPv4.
2010-02-02 22:22:27 +01:00
Guus Sliepen
ed14ef93b4 Immediately exchange keys when establishing a meta connection.
This in turn will trigger PMTU discovery, and ensures nodes know each others
reflexive UDP address and port.
2010-02-02 01:02:40 +01:00
Guus Sliepen
4a0b998151 Determine peer's reflexive address and port when exchanging keys.
To help peers that are behind NAT connect to each other directly via UDP, they
need to know the exact external address and port that they use. Keys exchanged
between NATted peers necessarily go via a third node, which knows this address
and port, and can append this information to the keys, which is in turned used
by the peers.

Since PMTU discovery will immediately trigger UDP communication from both sides
to each other, this should allow direct communication between peers behind
full, address-restricted and port-restricted cone NAT.
2010-02-02 00:51:44 +01:00
Guus Sliepen
d15099e002 Be liberal in accepting KEY_CHANGED/REQ_KEY/ANS_KEY requests.
When we got a key request for or from a node we don't know, we disconnected the
node that forwarded us that request.  However, especially in TunnelServer mode,
disconnecting does not help. We now ignore such requests, but since there is no
way of telling the original sender that the request was dropped, we now retry
sending REQ_KEY requests when we don't get an ANS_KEY back.
2010-01-23 18:48:01 +01:00
Guus Sliepen
469fa318bc Run subnet-up/down scripts for local MAC addresses as well. 2010-01-22 21:59:40 +01:00
Guus Sliepen
5d194b9f87 Fix subnet-up/down scripts being called with an empty SUBNET.
Commit 052ff8b2c5 contained a bug that causes
scripts to be called with an empty, or possibly corrupted SUBNET variable when
a Subnet is added or removed while the owner is still online. In router mode,
this normally does not happen, but in switch mode this is normal.
2010-01-22 21:47:26 +01:00
Guus Sliepen
b455111184 Make MSS clamping configurable, but enabled by default.
It can either be set globally in tinc.conf, or per-node in host config files.
2010-01-16 20:16:33 +01:00
Guus Sliepen
95928f7c29 Also clamp MSS of TCP over IPv6 packets. 2010-01-16 19:32:33 +01:00
Guus Sliepen
b1945f70fe Optimise handling of select() returning <= 0.
Before, we immediately retried select() if it returned -1 and errno is EAGAIN
or EINTR, and if it returned 0 it would check for network events even if we
know there are none.  Now, if -1 or 0 is returned we skip checking network
events, but we do check for timer and signal events.
2010-01-15 23:41:14 +01:00
Guus Sliepen
51099658c9 Ping nodes immediately when receiving SIGALRM.
One reason to send the ALRM signal is to let tinc immediately try to connect to
outgoing nodes, for example when PPP or DHCP configuration of the outgoing
interface finished.  Conversely, when the outgoing interface goes down one can
now send this signal to let tinc quickly detect that links are down too.
2010-01-15 23:19:08 +01:00
Guus Sliepen
2a538ed343 Clamp MSS of IPv4 SYN packets.
Some ISPs block the ICMP Fragmentation Needed packets that tinc sends.  We
clamp the MSS of IPv4 SYN packets to prevent hosts behind those ISPs from
sending too large packets.
2010-01-15 13:42:37 +01:00
Guus Sliepen
e4812ba9cc Allow Port and PMTUDiscovery options in tinc.conf, always enable PMTUDiscovery by default. 2009-12-24 12:42:21 +01:00
Guus Sliepen
7203d5fb07 Use xstrdup() instead of xasprintf() to copy static strings. 2009-12-23 19:51:55 +01:00
Guus Sliepen
a9a803d566 Allow port to be specified in Address statements.
This allows one to connect to use more than one port number to connect to
another node. The syntax is now:

Address = <hostname> [<port>]
2009-12-23 19:49:38 +01:00
Guus Sliepen
43e34d8180 Do not fragment packets smaller than RFC defined minimum MTUs.
For IPv6, the minimum MTU is 1280 (RFC 2460), for IPv4 the minimum is actually
68, but this is such a low limit that it will probably hurt performance, so we
do as if it is 576 (the minimum packet size hosts should be able to handle, RFC
791). If we detect a path MTU smaller than those minima, and we have to handle
a packet that is bigger than the PMTU but smaller than those minima, we forward
them via TCP instead of fragmenting or returning ICMP packets.
2009-12-23 19:22:06 +01:00
Guus Sliepen
369fe1ab1c Forget addresses of unreachable nodes.
We clear the cached address used for UDP connections when a node becomes
unreachable. This also prevents host-up scripts from passing the old, cached
address from when the host becomes reachable again from a different address.
2009-12-08 22:18:37 +00:00
Guus Sliepen
62f235e05c Remove unused variable in lookup_subnet_*() functions. 2009-11-28 11:56:13 +00:00
Guus Sliepen
92aefd25bf When learning MAC addresses, only check our own Subnets for previous entries.
Before it would check all addresses, and not learn an address if another node
already claimed that address. This caused fast roaming to fail, the code from
commit 6f6f426b35 was never triggered.
2009-11-28 11:52:23 +00:00
Guus Sliepen
44834d0304 Releasing 1.0.11. 2009-11-01 16:24:39 +01:00
Guus Sliepen
d331f04e45 Start a tinc service if it already exists. 2009-11-01 15:57:28 +01:00
Guus Sliepen
6f6f426b35 Fast handoff of roaming MAC addresses.
In switch mode, if a known MAC address is claimed by a second node before it
expired at the first node, it is likely that this is because a computer has
roamed from the LAN of the first node to that of the second node. To ensure
packets for that computer are routed to the second node, the first node should
delete its corresponding Subnet as soon as possible, without waiting for the
normal expiry timeout.
2009-10-27 23:53:49 +01:00
Guus Sliepen
e00b44cb98 Move socket error interpretation to utils.h. 2009-10-25 01:40:07 +02:00
Guus Sliepen
c11dc8079b Use WSAGetLastError() to determine cause of network errors on Windows.
This reduces log spam and lets path MTU discovery work faster.
2009-10-25 00:50:09 +02:00
Michael Tokarev
1bca167b7e Remove localedir leftovers. 2009-10-24 23:46:11 +02:00
Guus Sliepen
c3acae034c Use IP_DONTFRAGMENT instead of IP_MTU_DISCOVER on Windows.
This ensures the DF bit on outgoing UDP packets gets set on Windows when path
MTU discovery is enabled, reducing fragmentation.
2009-10-24 22:32:35 +02:00