526 lines
20 KiB
C
526 lines
20 KiB
C
/*
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* IrNET protocol module : Synchronous PPP over an IrDA socket.
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*
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* Jean II - HPL `00 - <jt@hpl.hp.com>
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*
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* This file contains definitions and declarations global to the IrNET module,
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* all grouped in one place...
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* This file is a *private* header, so other modules don't want to know
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* what's in there...
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*
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* Note : as most part of the Linux kernel, this module is available
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* under the GNU General Public License (GPL).
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*/
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#ifndef IRNET_H
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#define IRNET_H
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/************************** DOCUMENTATION ***************************/
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/*
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* What is IrNET
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* -------------
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* IrNET is a protocol allowing to carry TCP/IP traffic between two
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* IrDA peers in an efficient fashion. It is a thin layer, passing PPP
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* packets to IrTTP and vice versa. It uses PPP in synchronous mode,
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* because IrTTP offer a reliable sequenced packet service (as opposed
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* to a byte stream). In fact, you could see IrNET as carrying TCP/IP
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* in a IrDA socket, using PPP to provide the glue.
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*
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* The main difference with traditional PPP over IrCOMM is that we
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* avoid the framing and serial emulation which are a performance
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* bottleneck. It also allows multipoint communications in a sensible
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* fashion.
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*
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* The main difference with IrLAN is that we use PPP for the link
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* management, which is more standard, interoperable and flexible than
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* the IrLAN protocol. For example, PPP adds authentication,
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* encryption, compression, header compression and automated routing
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* setup. And, as IrNET let PPP do the hard work, the implementation
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* is much simpler than IrLAN.
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*
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* The Linux implementation
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* ------------------------
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* IrNET is written on top of the Linux-IrDA stack, and interface with
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* the generic Linux PPP driver. Because IrNET depend on recent
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* changes of the PPP driver interface, IrNET will work only with very
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* recent kernel (2.3.99-pre6 and up).
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*
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* The present implementation offer the following features :
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* o simple user interface using pppd
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* o efficient implementation (interface directly to PPP and IrTTP)
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* o addressing (you can specify the name of the IrNET recipient)
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* o multipoint operation (limited by IrLAP specification)
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* o information in /proc/net/irda/irnet
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* o IrNET events on /dev/irnet (for user space daemon)
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* o IrNET daemon (irnetd) to automatically handle incoming requests
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* o Windows 2000 compatibility (tested, but need more work)
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* Currently missing :
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* o Lot's of testing (that's your job)
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* o Connection retries (may be too hard to do)
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* o Check pppd persist mode
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* o User space daemon (to automatically handle incoming requests)
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*
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* The setup is not currently the most easy, but this should get much
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* better when everything will get integrated...
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*
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* Acknowledgements
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* ----------------
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* This module is based on :
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* o The PPP driver (ppp_synctty/ppp_generic) by Paul Mackerras
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* o The IrLAN protocol (irlan_common/XXX) by Dag Brattli
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* o The IrSock interface (af_irda) by Dag Brattli
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* o Some other bits from the kernel and my drivers...
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* Infinite thanks to those brave souls for providing the infrastructure
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* upon which IrNET is built.
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*
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* Thanks to all my collegues in HP for helping me. In particular,
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* thanks to Salil Pradhan and Bill Serra for W2k testing...
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* Thanks to Luiz Magalhaes for irnetd and much testing...
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*
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* Thanks to Alan Cox for answering lot's of my stupid questions, and
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* to Paul Mackerras answering my questions on how to best integrate
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* IrNET and pppd.
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*
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* Jean II
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*
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* Note on some implementations choices...
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* ------------------------------------
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* 1) Direct interface vs tty/socket
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* I could have used a tty interface to hook to ppp and use the full
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* socket API to connect to IrDA. The code would have been easier to
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* maintain, and maybe the code would have been smaller...
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* Instead, we hook directly to ppp_generic and to IrTTP, which make
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* things more complicated...
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*
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* The first reason is flexibility : this allow us to create IrNET
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* instances on demand (no /dev/ircommX crap) and to allow linkname
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* specification on pppd command line...
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*
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* Second reason is speed optimisation. If you look closely at the
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* transmit and receive paths, you will notice that they are "super lean"
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* (that's why they look ugly), with no function calls and as little data
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* copy and modification as I could...
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*
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* 2) irnetd in user space
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* irnetd is implemented in user space, which is necessary to call pppd.
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* This also give maximum benefits in term of flexibility and customability,
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* and allow to offer the event channel, useful for other stuff like debug.
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*
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* On the other hand, this require a loose coordination between the
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* present module and irnetd. One critical area is how incoming request
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* are handled.
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* When irnet receive an incoming request, it send an event to irnetd and
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* drop the incoming IrNET socket.
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* irnetd start a pppd instance, which create a new IrNET socket. This new
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* socket is then connected in the originating node to the pppd instance.
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* At this point, in the originating node, the first socket is closed.
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*
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* I admit, this is a bit messy and waste some resources. The alternative
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* is caching incoming socket, and that's also quite messy and waste
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* resources.
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* We also make connection time slower. For example, on a 115 kb/s link it
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* adds 60ms to the connection time (770 ms). However, this is slower than
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* the time it takes to fire up pppd on my P133...
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*
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*
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* History :
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* -------
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*
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* v1 - 15.5.00 - Jean II
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* o Basic IrNET (hook to ppp_generic & IrTTP - incl. multipoint)
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* o control channel on /dev/irnet (set name/address)
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* o event channel on /dev/irnet (for user space daemon)
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*
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* v2 - 5.6.00 - Jean II
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* o Enable DROP_NOT_READY to avoid PPP timeouts & other weirdness...
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* o Add DISCONNECT_TO event and rename DISCONNECT_FROM.
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* o Set official device number alloaction on /dev/irnet
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*
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* v3 - 30.8.00 - Jean II
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* o Update to latest Linux-IrDA changes :
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* - queue_t => irda_queue_t
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* o Update to ppp-2.4.0 :
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* - move irda_irnet_connect from PPPIOCATTACH to TIOCSETD
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* o Add EXPIRE event (depend on new IrDA-Linux patch)
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* o Switch from `hashbin_remove' to `hashbin_remove_this' to fix
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* a multilink bug... (depend on new IrDA-Linux patch)
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* o fix a self->daddr to self->raddr in irda_irnet_connect to fix
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* another multilink bug (darn !)
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* o Remove LINKNAME_IOCTL cruft
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*
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* v3b - 31.8.00 - Jean II
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* o Dump discovery log at event channel startup
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*
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* v4 - 28.9.00 - Jean II
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* o Fix interaction between poll/select and dump discovery log
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* o Add IRNET_BLOCKED_LINK event (depend on new IrDA-Linux patch)
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* o Add IRNET_NOANSWER_FROM event (mostly to help support)
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* o Release flow control in disconnect_indication
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* o Block packets while connecting (speed up connections)
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*
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* v5 - 11.01.01 - Jean II
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* o Init self->max_header_size, just in case...
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* o Set up ap->chan.hdrlen, to get zero copy on tx side working.
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* o avoid tx->ttp->flow->ppp->tx->... loop, by checking flow state
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* Thanks to Christian Gennerat for finding this bug !
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* ---
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* o Declare the proper MTU/MRU that we can support
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* (but PPP doesn't read the MTU value :-()
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* o Declare hashbin HB_NOLOCK instead of HB_LOCAL to avoid
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* disabling and enabling irq twice
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*
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* v6 - 31.05.01 - Jean II
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* o Print source address in Found, Discovery, Expiry & Request events
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* o Print requested source address in /proc/net/irnet
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* o Change control channel input. Allow multiple commands in one line.
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* o Add saddr command to change ap->rsaddr (and use that in IrDA)
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* ---
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* o Make the IrDA connection procedure totally asynchronous.
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* Heavy rewrite of the IAS query code and the whole connection
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* procedure. Now, irnet_connect() no longer need to be called from
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* a process context...
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* o Enable IrDA connect retries in ppp_irnet_send(). The good thing
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* is that IrDA connect retries are directly driven by PPP LCP
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* retries (we retry for each LCP packet), so that everything
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* is transparently controlled from pppd lcp-max-configure.
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* o Add ttp_connect flag to prevent rentry on the connect procedure
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* o Test and fixups to eliminate side effects of retries
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*
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* v7 - 22.08.01 - Jean II
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* o Cleanup : Change "saddr = 0x0" to "saddr = DEV_ADDR_ANY"
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* o Fix bug in BLOCK_WHEN_CONNECT introduced in v6 : due to the
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* asynchronous IAS query, self->tsap is NULL when PPP send the
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* first packet. This was preventing "connect-delay 0" to work.
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* Change the test in ppp_irnet_send() to self->ttp_connect.
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*
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* v8 - 1.11.01 - Jean II
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* o Tighten the use of self->ttp_connect and self->ttp_open to
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* prevent various race conditions.
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* o Avoid leaking discovery log and skb
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* o Replace "self" with "server" in irnet_connect_indication() to
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* better detect cut'n'paste error ;-)
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*
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* v9 - 29.11.01 - Jean II
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* o Fix event generation in disconnect indication that I broke in v8
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* It was always generation "No-Answer" because I was testing ttp_open
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* just after clearing it. *blush*.
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* o Use newly created irttp_listen() to fix potential crash when LAP
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* destroyed before irnet module removed.
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*
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* v10 - 4.3.2 - Jean II
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* o When receiving a disconnect indication, don't reenable the
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* PPP Tx queue, this will trigger a reconnect. Instead, close
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* the channel, which will kill pppd...
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*
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* v11 - 20.3.02 - Jean II
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* o Oops ! v10 fix disabled IrNET retries and passive behaviour.
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* Better fix in irnet_disconnect_indication() :
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* - if connected, kill pppd via hangup.
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* - if not connected, reenable ppp Tx, which trigger IrNET retry.
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*
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* v12 - 10.4.02 - Jean II
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* o Fix race condition in irnet_connect_indication().
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* If the socket was already trying to connect, drop old connection
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* and use new one only if acting as primary. See comments.
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*
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* v13 - 30.5.02 - Jean II
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* o Update module init code
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*
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* v14 - 20.2.03 - Jean II
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* o Add discovery hint bits in the control channel.
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* o Remove obsolete MOD_INC/DEC_USE_COUNT in favor of .owner
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*
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* v15 - 7.4.03 - Jean II
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* o Replace spin_lock_irqsave() with spin_lock_bh() so that we can
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* use ppp_unit_number(). It's probably also better overall...
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* o Disable call to ppp_unregister_channel(), because we can't do it.
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*/
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/***************************** INCLUDES *****************************/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include <linux/tty.h>
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#include <linux/proc_fs.h>
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#include <linux/netdevice.h>
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#include <linux/miscdevice.h>
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#include <linux/poll.h>
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#include <linux/capability.h>
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#include <linux/ctype.h> /* isspace() */
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#include <asm/uaccess.h>
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#include <linux/init.h>
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#include <linux/ppp_defs.h>
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#include <linux/if_ppp.h>
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#include <linux/ppp_channel.h>
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#include <net/irda/irda.h>
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#include <net/irda/iriap.h>
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#include <net/irda/irias_object.h>
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#include <net/irda/irlmp.h>
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#include <net/irda/irttp.h>
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#include <net/irda/discovery.h>
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/***************************** OPTIONS *****************************/
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/*
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* Define or undefine to compile or not some optional part of the
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* IrNET driver...
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* Note : the present defaults make sense, play with that at your
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* own risk...
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*/
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/* IrDA side of the business... */
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#define DISCOVERY_NOMASK /* To enable W2k compatibility... */
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#define ADVERTISE_HINT /* Advertise IrLAN hint bit */
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#define ALLOW_SIMULT_CONNECT /* This seem to work, cross fingers... */
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#define DISCOVERY_EVENTS /* Query the discovery log to post events */
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#define INITIAL_DISCOVERY /* Dump current discovery log as events */
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#undef STREAM_COMPAT /* Not needed - potentially messy */
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#undef CONNECT_INDIC_KICK /* Might mess IrDA, not needed */
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#undef FAIL_SEND_DISCONNECT /* Might mess IrDA, not needed */
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#undef PASS_CONNECT_PACKETS /* Not needed ? Safe */
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#undef MISSING_PPP_API /* Stuff I wish I could do */
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/* PPP side of the business */
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#define BLOCK_WHEN_CONNECT /* Block packets when connecting */
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#define CONNECT_IN_SEND /* Retry IrDA connection procedure */
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#undef FLUSH_TO_PPP /* Not sure about this one, let's play safe */
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#undef SECURE_DEVIRNET /* Bah... */
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/****************************** DEBUG ******************************/
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/*
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* This set of flags enable and disable all the various warning,
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* error and debug message of this driver.
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* Each section can be enabled and disabled independently
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*/
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/* In the PPP part */
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#define DEBUG_CTRL_TRACE 0 /* Control channel */
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#define DEBUG_CTRL_INFO 0 /* various info */
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#define DEBUG_CTRL_ERROR 1 /* problems */
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#define DEBUG_FS_TRACE 0 /* filesystem callbacks */
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#define DEBUG_FS_INFO 0 /* various info */
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#define DEBUG_FS_ERROR 1 /* problems */
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#define DEBUG_PPP_TRACE 0 /* PPP related functions */
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#define DEBUG_PPP_INFO 0 /* various info */
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#define DEBUG_PPP_ERROR 1 /* problems */
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#define DEBUG_MODULE_TRACE 0 /* module insertion/removal */
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#define DEBUG_MODULE_ERROR 1 /* problems */
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/* In the IrDA part */
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#define DEBUG_IRDA_SR_TRACE 0 /* IRDA subroutines */
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#define DEBUG_IRDA_SR_INFO 0 /* various info */
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#define DEBUG_IRDA_SR_ERROR 1 /* problems */
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#define DEBUG_IRDA_SOCK_TRACE 0 /* IRDA main socket functions */
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#define DEBUG_IRDA_SOCK_INFO 0 /* various info */
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#define DEBUG_IRDA_SOCK_ERROR 1 /* problems */
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#define DEBUG_IRDA_SERV_TRACE 0 /* The IrNET server */
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#define DEBUG_IRDA_SERV_INFO 0 /* various info */
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#define DEBUG_IRDA_SERV_ERROR 1 /* problems */
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#define DEBUG_IRDA_TCB_TRACE 0 /* IRDA IrTTP callbacks */
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#define DEBUG_IRDA_CB_INFO 0 /* various info */
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#define DEBUG_IRDA_CB_ERROR 1 /* problems */
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#define DEBUG_IRDA_OCB_TRACE 0 /* IRDA other callbacks */
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#define DEBUG_IRDA_OCB_INFO 0 /* various info */
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#define DEBUG_IRDA_OCB_ERROR 1 /* problems */
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#define DEBUG_ASSERT 0 /* Verify all assertions */
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/*
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* These are the macros we are using to actually print the debug
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* statements. Don't look at it, it's ugly...
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*
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* One of the trick is that, as the DEBUG_XXX are constant, the
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* compiler will optimise away the if() in all cases.
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*/
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/* All error messages (will show up in the normal logs) */
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#define DERROR(dbg, format, args...) \
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{if(DEBUG_##dbg) \
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printk(KERN_INFO "irnet: %s(): " format, __func__ , ##args);}
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/* Normal debug message (will show up in /var/log/debug) */
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#define DEBUG(dbg, format, args...) \
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{if(DEBUG_##dbg) \
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printk(KERN_DEBUG "irnet: %s(): " format, __func__ , ##args);}
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/* Entering a function (trace) */
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#define DENTER(dbg, format, args...) \
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{if(DEBUG_##dbg) \
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printk(KERN_DEBUG "irnet: -> %s" format, __func__ , ##args);}
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/* Entering and exiting a function in one go (trace) */
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#define DPASS(dbg, format, args...) \
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{if(DEBUG_##dbg) \
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printk(KERN_DEBUG "irnet: <>%s" format, __func__ , ##args);}
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/* Exiting a function (trace) */
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#define DEXIT(dbg, format, args...) \
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{if(DEBUG_##dbg) \
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printk(KERN_DEBUG "irnet: <-%s()" format, __func__ , ##args);}
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/* Exit a function with debug */
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#define DRETURN(ret, dbg, args...) \
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{DEXIT(dbg, ": " args);\
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return ret; }
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/* Exit a function on failed condition */
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#define DABORT(cond, ret, dbg, args...) \
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{if(cond) {\
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DERROR(dbg, args);\
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return ret; }}
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/* Invalid assertion, print out an error and exit... */
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#define DASSERT(cond, ret, dbg, args...) \
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{if((DEBUG_ASSERT) && !(cond)) {\
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DERROR(dbg, "Invalid assertion: " args);\
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return ret; }}
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/************************ CONSTANTS & MACROS ************************/
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/* Paranoia */
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#define IRNET_MAGIC 0xB00754
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/* Number of control events in the control channel buffer... */
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#define IRNET_MAX_EVENTS 8 /* Should be more than enough... */
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/****************************** TYPES ******************************/
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/*
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* This is the main structure where we store all the data pertaining to
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* one instance of irnet.
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* Note : in irnet functions, a pointer this structure is usually called
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* "ap" or "self". If the code is borrowed from the IrDA stack, it tend
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* to be called "self", and if it is borrowed from the PPP driver it is
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* "ap". Apart from that, it's exactly the same structure ;-)
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*/
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typedef struct irnet_socket
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{
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/* ------------------- Instance management ------------------- */
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/* We manage a linked list of IrNET socket instances */
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irda_queue_t q; /* Must be first - for hasbin */
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int magic; /* Paranoia */
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/* --------------------- FileSystem part --------------------- */
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/* "pppd" interact directly with us on a /dev/ file */
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struct file * file; /* File descriptor of this instance */
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/* TTY stuff - to keep "pppd" happy */
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struct ktermios termios; /* Various tty flags */
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/* Stuff for the control channel */
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int event_index; /* Last read in the event log */
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/* ------------------------- PPP part ------------------------- */
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/* We interface directly to the ppp_generic driver in the kernel */
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int ppp_open; /* registered with ppp_generic */
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struct ppp_channel chan; /* Interface to generic ppp layer */
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int mru; /* Max size of PPP payload */
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u32 xaccm[8]; /* Asynchronous character map (just */
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u32 raccm; /* to please pppd - dummy) */
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unsigned int flags; /* PPP flags (compression, ...) */
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unsigned int rbits; /* Unused receive flags ??? */
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struct work_struct disconnect_work; /* Process context disconnection */
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/* ------------------------ IrTTP part ------------------------ */
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/* We create a pseudo "socket" over the IrDA tranport */
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unsigned long ttp_open; /* Set when IrTTP is ready */
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unsigned long ttp_connect; /* Set when IrTTP is connecting */
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struct tsap_cb * tsap; /* IrTTP instance (the connection) */
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char rname[NICKNAME_MAX_LEN + 1];
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/* IrDA nickname of destination */
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__u32 rdaddr; /* Requested peer IrDA address */
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__u32 rsaddr; /* Requested local IrDA address */
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__u32 daddr; /* actual peer IrDA address */
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__u32 saddr; /* my local IrDA address */
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__u8 dtsap_sel; /* Remote TSAP selector */
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__u8 stsap_sel; /* Local TSAP selector */
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__u32 max_sdu_size_rx;/* Socket parameters used for IrTTP */
|
|
__u32 max_sdu_size_tx;
|
|
__u32 max_data_size;
|
|
__u8 max_header_size;
|
|
LOCAL_FLOW tx_flow; /* State of the Tx path in IrTTP */
|
|
|
|
/* ------------------- IrLMP and IrIAS part ------------------- */
|
|
/* Used for IrDA Discovery and socket name resolution */
|
|
void * ckey; /* IrLMP client handle */
|
|
__u16 mask; /* Hint bits mask (filter discov.)*/
|
|
int nslots; /* Number of slots for discovery */
|
|
|
|
struct iriap_cb * iriap; /* Used to query remote IAS */
|
|
int errno; /* status of the IAS query */
|
|
|
|
/* -------------------- Discovery log part -------------------- */
|
|
/* Used by initial discovery on the control channel
|
|
* and by irnet_discover_daddr_and_lsap_sel() */
|
|
struct irda_device_info *discoveries; /* Copy of the discovery log */
|
|
int disco_index; /* Last read in the discovery log */
|
|
int disco_number; /* Size of the discovery log */
|
|
|
|
} irnet_socket;
|
|
|
|
/*
|
|
* This is the various event that we will generate on the control channel
|
|
*/
|
|
typedef enum irnet_event
|
|
{
|
|
IRNET_DISCOVER, /* New IrNET node discovered */
|
|
IRNET_EXPIRE, /* IrNET node expired */
|
|
IRNET_CONNECT_TO, /* IrNET socket has connected to other node */
|
|
IRNET_CONNECT_FROM, /* Other node has connected to IrNET socket */
|
|
IRNET_REQUEST_FROM, /* Non satisfied connection request */
|
|
IRNET_NOANSWER_FROM, /* Failed connection request */
|
|
IRNET_BLOCKED_LINK, /* Link (IrLAP) is blocked for > 3s */
|
|
IRNET_DISCONNECT_FROM, /* IrNET socket has disconnected */
|
|
IRNET_DISCONNECT_TO /* Closing IrNET socket */
|
|
} irnet_event;
|
|
|
|
/*
|
|
* This is the storage for an event and its arguments
|
|
*/
|
|
typedef struct irnet_log
|
|
{
|
|
irnet_event event;
|
|
int unit;
|
|
__u32 saddr;
|
|
__u32 daddr;
|
|
char name[NICKNAME_MAX_LEN + 1]; /* 21 + 1 */
|
|
__u16_host_order hints; /* Discovery hint bits */
|
|
} irnet_log;
|
|
|
|
/*
|
|
* This is the storage for all events and related stuff...
|
|
*/
|
|
typedef struct irnet_ctrl_channel
|
|
{
|
|
irnet_log log[IRNET_MAX_EVENTS]; /* Event log */
|
|
int index; /* Current index in log */
|
|
spinlock_t spinlock; /* Serialize access to the event log */
|
|
wait_queue_head_t rwait; /* processes blocked on read (or poll) */
|
|
} irnet_ctrl_channel;
|
|
|
|
/**************************** PROTOTYPES ****************************/
|
|
/*
|
|
* Global functions of the IrNET module
|
|
* Note : we list here also functions called from one file to the other.
|
|
*/
|
|
|
|
/* -------------------------- IRDA PART -------------------------- */
|
|
extern int
|
|
irda_irnet_create(irnet_socket *); /* Initialise a IrNET socket */
|
|
extern int
|
|
irda_irnet_connect(irnet_socket *); /* Try to connect over IrDA */
|
|
extern void
|
|
irda_irnet_destroy(irnet_socket *); /* Teardown a IrNET socket */
|
|
extern int
|
|
irda_irnet_init(void); /* Initialise IrDA part of IrNET */
|
|
extern void
|
|
irda_irnet_cleanup(void); /* Teardown IrDA part of IrNET */
|
|
|
|
/**************************** VARIABLES ****************************/
|
|
|
|
/* Control channel stuff - allocated in irnet_irda.h */
|
|
extern struct irnet_ctrl_channel irnet_events;
|
|
|
|
#endif /* IRNET_H */
|