c1b1203d65
There are a mix of function prototypes with and without extern in the kernel sources. Standardize on not using extern for function prototypes. Function prototypes don't need to be written with extern. extern is assumed by the compiler. Its use is as unnecessary as using auto to declare automatic/local variables in a block. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
524 lines
20 KiB
C
524 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 colleagues 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 <linux/string.h> /* skip_spaces() */
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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/ppp-ioctl.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 */
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|
__u32 max_sdu_size_tx;
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|
__u32 max_data_size;
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|
__u8 max_header_size;
|
|
LOCAL_FLOW tx_flow; /* State of the Tx path in IrTTP */
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|
|
|
/* ------------------- IrLMP and IrIAS part ------------------- */
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|
/* Used for IrDA Discovery and socket name resolution */
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|
void * ckey; /* IrLMP client handle */
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|
__u16 mask; /* Hint bits mask (filter discov.)*/
|
|
int nslots; /* Number of slots for discovery */
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|
|
|
struct iriap_cb * iriap; /* Used to query remote IAS */
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|
int errno; /* status of the IAS query */
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|
|
|
/* -------------------- 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 */
|
|
|
|
struct mutex lock;
|
|
|
|
} 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 */
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|
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 -------------------------- */
|
|
int irda_irnet_create(irnet_socket *); /* Initialise an IrNET socket */
|
|
int irda_irnet_connect(irnet_socket *); /* Try to connect over IrDA */
|
|
void irda_irnet_destroy(irnet_socket *); /* Teardown an IrNET socket */
|
|
int irda_irnet_init(void); /* Initialise IrDA part of IrNET */
|
|
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 */
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