Cross Reference: /net/dccp/feat.c

History log of /net/dccp/feat.c
Revision	Date	Author	Comments
2c53040f018b6c36a46eec75b9b937aaa5f78e6d	10-Jul-2012	Ben Hutchings <bhutchings@solarflare.com>	net: Fix (nearly-)kernel-doc comments for various functions Fix incorrect start markers, wrapped summary lines, missing section breaks, incorrect separators, and some name mismatches. Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
3db1cd5c05f35fb43eb134df6f321de4e63141f2	19-Dec-2011	Rusty Russell <rusty@rustcorp.com.au>	net: fix assignment of 0/1 to bool variables. DaveM said: Please, this kind of stuff rots forever and not using bool properly drives me crazy. Joe Perches <joe@perches.com> gave me the spatch script: @@ bool b; @@ -b = 0 +b = false @@ bool b; @@ -b = 1 +b = true I merely installed coccinelle, read the documentation and took credit. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: David S. Miller <davem@davemloft.net>
a6444f4237af6c9981ddd45ab35a5c06d4e5a4d8	25-Jul-2011	Samuel Jero <sj323707@ohio.edu>	dccp: send Confirm options only once If a connection is in the OPEN state, remove feature negotiation Confirm options from the list of options after sending them once; as such options are NOT supposed to be retransmitted and are ONLY supposed to be sent in response to a Change option (RFC 4340 6.2). Signed-off-by: Samuel Jero <sj323707@ohio.edu> Acked-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
44e6fd9e67c1043aaeed381c10b74e73807b7f26	25-Jul-2011	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: support for exchanging of NN options in established state 2/2 This patch adds the receiver side and the (fast-path) activation part for dynamic changes of non-negotiable (NN) parameters in (PART)OPEN state. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Samuel Jero <sj323707@ohio.edu> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.uk>
d6916f87ca5e566786f1a935a7cabba54774bbda	25-Jul-2011	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: support for the exchange of NN options in established state 1/2 In contrast to static feature negotiation at the begin of a connection, this patch introduces support for exchange of dynamically changing options. Such an update/exchange is necessary in at least two cases: * CCID-2's Ack Ratio (RFC 4341, 6.1.2) which changes during the connection; * Sequence Window values that, as per RFC 4340, 7.5.2, should be sent "as the connection progresses". Both are non-negotiable (NN) features, which means that no new capabilities are negotiated, but rather that changes in known parameters are brought up-to-date at either end. Thse characteristics are reflected by the implementation: * only NN options can be exchanged after connection setup; * an ack is scheduled directly after activation to speed up the update; * CCIDs may request changes to an NN feature even if a negotiation for that feature is already underway: this is required by CCID-2, where changes in cwnd necessitate Ack Ratio changes, such that the previous Ack Ratio (which is still being negotiated) would cause irrecoverable RTO timeouts (thanks to work by Samuel Jero). Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Samuel Jero <sj323707@ohio.edu> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.uk>
1f4f0f645cc1d7f1187fcdb0ac22c2e69bd68050	05-Oct-2010	stephen hemminger <shemminger@vyatta.com>	dccp: Kill dead code and add static markers. Remove dead code and make some functions static. Compile tested only. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
5a0e3ad6af8660be21ca98a971cd00f331318c05	24-Mar-2010	Tejun Heo <tj@kernel.org>	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
36cbd3dcc10384f813ec0814255f576c84f2bcd4	05-Aug-2009	Jan Engelhardt <jengelh@medozas.de>	net: mark read-only arrays as const String literals are constant, and usually, we can also tag the array of pointers const too, moving it to the .rodata section. Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: David S. Miller <davem@davemloft.net>
f3f3abb62ccb1a1c77bcce855c04e12356e6ac95	17-Jan-2009	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Debugging functions for feature negotiation Since all feature-negotiation processing now takes place in feat.c, functions for producing verbose debugging output are concentrated there. New functions to print out values, entry records, and options are provided, and also a macro is defined to not always have the function name in the output line. Thanks a lot to Wei Yongjun and Giuseppe Galeota for help and discussion with an earlier revision of this patch. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: David S. Miller <davem@davemloft.net>
883ca833e5fb814fb03426c9d35e5489ce43e8da	17-Jan-2009	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Initialisation and type-checking of feature sysctls This patch takes care of initialising and type-checking sysctls related to feature negotiation. Type checking is important since some of the sysctls now directly impact the feature-negotiation process. The sysctls are initialised with the known default values for each feature. For the type-checking the value constraints from RFC 4340 are used: * Sequence Window uses the specified Wmin=32, the maximum is ulong (4 bytes), tested and confirmed that it works up to 4294967295 - for Gbps speed; * Ack Ratio is between 0 .. 0xffff (2-byte unsigned integer); * CCIDs are between 0 .. 255; * request_retries, retries1, retries2 also between 0..255 for good measure; * tx_qlen is checked to be non-negative; * sync_ratelimit remains as before. Notes: ------ 1. Die s@sysctl_dccp_feat@sysctl_dccp@g since the sysctls are now in feat.c. 2. As pointed out by Arnaldo, the pattern of type-checking repeats itself in other places, sometimes with exactly the same kind of definitions (e.g. "static int zero;"). It may be a good idea (kernel janitors?) to consolidate type checking. For the sake of keeping the changeset small and in order not to affect other subsystems, I have not strived to generalise here. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: David S. Miller <davem@davemloft.net>
792b48780e8b6435d017cef4b5c304876a48653e	17-Jan-2009	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Implement both feature-local and feature-remote Sequence Window feature This adds full support for local/remote Sequence Window feature, from which the * sequence-number-validity (W) and * acknowledgment-number-validity (W') windows derive as specified in RFC 4340, 7.5.3. Specifically, the following is contained in this patch: * integrated new socket fields into dccp_sk; * updated the update_gsr/gss routines with regard to these fields; * updated handler code: the Sequence Window feature is located at the TX side, so the local feature is meant if the handler-rx flag is false; * the initialisation of `rcv_wnd' in reqsk is removed, since - rcv_wnd is not used by the code anywhere; - sequence number checks are not done in the LISTEN state (cf. 7.5.3); - dccp_check_req checks the Ack number validity more rigorously; * the `struct dccp_minisock' became empty and is now removed. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: David S. Miller <davem@davemloft.net>
f90f92eed74251034f251e3cdf4fa5c4c1f09df0	17-Jan-2009	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Initialisation framework for feature negotiation This initialises feature negotiation from two tables, which are in turn are initialised from sysctls. As a novel feature, specifics of the implementation (e.g. that short seqnos and ECN are not yet available) are advertised for robustness. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: David S. Miller <davem@davemloft.net>
129fa44785a399248ae2466b6cb5c655e96668f7	05-Jan-2009	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Integrate the TFRC library with DCCP This patch integrates the TFRC library, which is a dependency of CCID-3 (and CCID-4), with the new use of CCIDs in the DCCP module. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
e5fd56ca4eb3a130882bbef69d6952ef6aca5c8d	05-Jan-2009	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Clean up ccid.c after integration of CCID plugins This patch cleans up after integrating the CCID modules and, in addition, * moves the if/else cases from ccid_delete() into ccid_hc_{tx,rx}_delete(); * removes the 'gfp' argument to ccid_new() - since it is always gfp_any(). Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
4098dce5be537a157eed4a326efd464109825b8b	08-Dec-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Remove manual influence on NDP Count feature Updating the NDP count feature is handled automatically now: * for CCID-2 it is disabled, since the code does not use NDP counts; * for CCID-3 it is enabled, as NDP counts are used to determine loss lengths. Allowing the user to change NDP values leads to unpredictable and failing behaviour, since it is then possible to disable NDP counts even when they are needed (e.g. in CCID-3). This means that only those user settings are sensible that agree with the values for Send NDP Count implied by the choice of CCID. But those settings are already activated by the feature negotiation (CCID dependency tracking), hence this form of support is redundant. At startup the initialisation of the NDP count feature uses the default value of 0, which is done implicitly by the zeroing-out of the socket when it is allocated. If the choice of CCID or feature negotiation enables NDP count, this will then be updated via the NDP activation handler. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: David S. Miller <davem@davemloft.net>
0049bab5e765aa74cf767a834fa336e19453fc5e	08-Dec-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Remove obsolete parts of the old CCID interface The TX/RX CCIDs of the minisock are now redundant: similar to the Ack Vector case, their value equals initially that of the sysctl, but at the end of feature negotiation may be something different. The old interface removed by this patch thus has been replaced by the newer interface to dynamically query the currently loaded CCIDs. Also removed are the constructors for the TX CCID and the RX CCID, since the switch "rx <-> non-rx" is done by the handler in minisocks.c (and the handler is the only place in the code where CCIDs are loaded). Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: David S. Miller <davem@davemloft.net>
63b8e2861f31868dce9c92fd7444f212a5a8a775	08-Dec-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Clean up old feature-negotiation infrastructure The code removed by this patch is no longer referenced or used, the added lines update documentation and copyrights. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: David S. Miller <davem@davemloft.net>
422d9cdcb85b3622d08a590fed66021af7aea333	02-Dec-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Feature activation handlers This patch provides the post-processing of feature negotiation state, after the negotiation has completed. To this purpose, handlers are used and added to the dccp_feat_table. Each handler is passed a boolean flag whether the RX or TX side of the feature is meant. Several handlers are provided already, new handlers can easily be added. The initialisation is now fully dynamic, i.e. CCIDs are activated only after the feature negotiation. The integration of this dynamic activation is done in the subsequent patches. Thanks to Wei Yongjun for pointing out the necessity of skipping over empty Confirm options while copying the negotiated feature values. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: David S. Miller <davem@davemloft.net>
b1ad00422ecba0449f8e3a8f2ec9267bc994bf8f	02-Dec-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Processing Confirm options Analogous to the previous patch, this adds code to interpret incoming Confirm feature-negotiation options. Both functions operate on the feature-negotiation list of either the request_sock (server) or the dccp_sock (client). Thanks to Wei Yongjun for pointing out that it is overly restrictive to check the entire list of confirmed SP values. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: David S. Miller <davem@davemloft.net>
e77b8363b2ea7c0d89919547c1a8b0562f298b57	02-Dec-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Process incoming Change feature-negotiation options This adds/replaces code for processing incoming ChangeL/R options. The main difference is that: * mandatory FN options are now interpreted inside the function (there are too many individual cases to do this externally); * the function returns an appropriate Reset code or 0, which is then used to fill in the data for the Reset packet. Old code, which is no longer used or referenced, has been removed. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
75757a7d0c54f8fdd414c74a6005d275032b0115	02-Dec-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Preference list reconciliation This provides two functions to * reconcile preference lists (with appropriate return codes) and * reorder the preference list if successful reconciliation changed the preferred value. The patch also removes the old code for processing SP/NN Change options, since new code to process these is mostly there already; related references have been commented out. The code for processing Change options follows in the next patch. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: David S. Miller <davem@davemloft.net>
0971d17ca3d80f61863f4750091a64448bf91600	02-Dec-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Insert feature-negotiation options into skb This patch replaces the earlier insertion routine from options.c, so that code specific to feature negotiation can remain in feat.c. This is possible by calling a function already existing in options.c. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: David S. Miller <davem@davemloft.net>
3d3e35aa78c9498eed3209c9d82376085ed0c36f	20-Nov-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Fix bracing in dccp_feat_list_lookup. From: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
49aebc66d6b896f9c7c5739d85c4548c00015aa7	17-Nov-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Deprecate old setsockopt framework The previous setsockopt interface, which passed socket options via struct dccp_so_feat, is complicated/difficult to use. Continuing to support it leads to ugly code since the old approach did not distinguish between NN and SP values. This patch removes the old setsockopt interface and replaces it with two new functions to register NN/SP values for feature negotiation. These are essentially wrappers around the internal __feat_register functions, with checking added to avoid * wrong usage (type); * changing values while the connection is in progress. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
0c1168398ecbfacbb27203b281bde20ec9f78017	17-Nov-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Mechanism to resolve CCID dependencies This adds a hook to resolve features whose value depends on the choice of CCID. It is done at the server since it can only be done after the CCID values have been negotiated; i.e. the client will add its CCID preference list on the Change options sent in the Request, which will be reconciled with the local preference list of the server. The concept is documented on http://www.erg.abdn.ac.uk/users/gerrit/dccp/notes/feature_negotiation/\ implementation_notes.html#ccid_dependencies Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: David S. Miller <davem@davemloft.net>
9eca0a47dee201a73967026985b5f0a79a46bd36	12-Nov-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Resolve dependencies of features on choice of CCID This provides a missing link in the code chain, as several features implicitly depend and/or rely on the choice of CCID. Most notably, this is the Send Ack Vector feature, but also Ack Ratio and Send Loss Event Rate (also taken care of). For Send Ack Vector, the situation is as follows: * since CCID2 mandates the use of Ack Vectors, there is no point in allowing endpoints which use CCID2 to disable Ack Vector features such a connection; * a peer with a TX CCID of CCID2 will always expect Ack Vectors, and a peer with a RX CCID of CCID2 must always send Ack Vectors (RFC 4341, sec. 4); * for all other CCIDs, the use of (Send) Ack Vector is optional and thus negotiable. However, this implies that the code negotiating the use of Ack Vectors also supports it (i.e. is able to supply and to either parse or ignore received Ack Vectors). Since this is not the case (CCID-3 has no Ack Vector support), the use of Ack Vectors is here disabled, with a comment in the source code. An analogous consideration arises for the Send Loss Event Rate feature, since the CCID-3 implementation does not support the loss interval options of RFC 4342. To make such use explicit, corresponding feature-negotiation options are inserted which signal the use of the loss event rate option, as it is used by the CCID3 code. Lastly, the values of the Ack Ratio feature are matched to the choice of CCID. The patch implements this as a function which is called after the user has made all other registrations for changing default values of features. The table is variable-length, the reserved (and hence for feature-negotiation invalid, confirmed by considering section 19.4 of RFC 4340) feature number `0' is used to mark the end of the table. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: David S. Miller <davem@davemloft.net>
d90ebcbfa7f5a8b4e20518c9f94c5c4e4cd3c2e5	12-Nov-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Query supported CCIDs This provides a data structure to record which CCIDs are locally supported and three accessor functions: - a test function for internal use which is used to validate CCID requests made by the user; - a copy function so that the list can be used for feature-negotiation; - documented getsockopt() support so that the user can query capabilities. The data structure is a table which is filled in at compile-time with the list of available CCIDs (which in turn depends on the Kconfig choices). Using the copy function for cloning the list of supported CCIDs is useful for feature negotiation, since the negotiation is now with the full list of available CCIDs (e.g. {2, 3}) instead of the default value {2}. This means negotiation will not fail if the peer requests to use CCID3 instead of CCID2. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: David S. Miller <davem@davemloft.net>
e8ef967a54f401ac5e8637b7f7f8bddb006144c4	12-Nov-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Registration routines for changing feature values Two registration routines, for SP and NN features, are provided by this patch, replacing a previous routine which was used for both feature types. These are internal-only routines and therefore start with `__feat_register'. It further exports the known limits of Sequence Window and Ack Ratio as symbolic constants. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: David S. Miller <davem@davemloft.net>
f74e91b6cca5889e667193c7e794186db73c2000	12-Nov-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Limit feature negotiation to connection setup phase This patch limits feature (capability) negotation to the connection setup phase: 1. Although it is theoretically possible to perform feature negotiation at any time (and RFC 4340 supports this), in practice this is prohibitively complex, as it requires to put traffic on hold for each new negotiation. 2. As a byproduct of restricting feature negotiation to connection setup, the feature-negotiation retransmit timer is no longer required. This part is now mapped onto the protocol-level retransmission. Details indicating why timers are no longer needed can be found on http://www.erg.abdn.ac.uk/users/gerrit/dccp/notes/feature_negotiation/\ implementation_notes.html This patch disables anytime negotiation, subsequent patches work out full feature negotiation support for connection setup. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
ac75773c2742d82cbcb078708df406e9017224b7	05-Nov-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Per-socket initialisation of feature negotiation This provides feature-negotiation initialisation for both DCCP sockets and DCCP request_sockets, to support feature negotiation during connection setup. It also resolves a FIXME regarding the congestion control initialisation. Thanks to Wei Yongjun for help with the IPv6 side of this patch. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: David S. Miller <davem@davemloft.net>
61e6473efbd6087e1db3aaa93a5266c5bfd8aa99	05-Nov-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: List management for new feature negotiation This adds list initial fields and list management functions for the new feature negotiation implementation. Thanks to Arnaldo for suggestions and improvements. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: David S. Miller <davem@davemloft.net>
7d43d1a0f2cf535167ec7247f110a1f85cecac43	05-Nov-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Implement lookup table for feature-negotiation information A lookup table for feature-negotiation information, extracted from RFC 4340/42, is provided by this patch. All currently known features can be found in this table, along with their feature location, their default value, and type. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
410e27a49bb98bc7fa3ff5fc05cc313817b9f253	09-Sep-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	This reverts "Merge branch 'dccp' of git://eden-feed.erg.abdn.ac.uk/dccp_exp" as it accentally contained the wrong set of patches. These will be submitted separately. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
2faae5587f692fd5c79856ca4c4b90944ee0472a	04-Sep-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp ccid-2: Use feature-negotiation to report Ack Ratio changes This uses the new feature-negotiation framework to signal Ack Ratio changes, as required by RFC 4341, sec. 6.1.2. This raises some problems for CCID-2 since it can at the moment not cope gracefully with Ack Ratio of e.g. 2. A FIXME has thus been added which reverts to the existing policy of bypassing the Ack Ratio sysctl. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
4861a354430d2ea36847ef88086c7449b4f385b6	04-Sep-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Support for exchanging of NN options in established state This patch provides support for the reception of NN options in (PART)OPEN state. It is a combination of change_recv() and confirm_recv(), specifically geared towards receiving the `fast-path' NN options. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
624a965a93610152b10c73d050ed44812efa8abe	04-Sep-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Support for the exchange of NN options in established state In contrast to static feature negotiation at the begin of a connection, which establishes the capabilities of both endpoints, this patch introduces support for dynamic exchange of feature negotiation options. Such a dynamic exchange is necessary in at least two cases: * CCID-2's Ack Ratio (RFC 4341, 6.1.2) which changes during the connection; * Sequence Window values that, as per RFC 4340, 7.5.2, should be sent "as as the connection progresses". Both are NN (non-negotiable) features. Hence dynamic feature "negotiation" is distinguished from static/pre-connection negotiation by the following: * no new capabilities are negotiated (those that matter for the connection are negotiated prior to setting up the connection, comparable to SIP); * features must be understood by each endpoint: as per RFC 4340, 6.4, Sequence Window is "Req'd" and Ack Ratio must be understood when CCID-2 is used as per the note underneath Table 4. These characteristics are reflected in the implementation: * only NN options can be exchanged after connection setup; * NN options are activated directly after validating them. The rationale is that a peer must accept every valid NN value (RFC 4340, 6.3.2), hence it will either accept the value and send a "Confirm R", or it will send an empty Confirm (which will reset the connection according to FN rules). * An Ack is scheduled directly after activation to accelerate communicating the update to the peer. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
76f738a7950b559a23ab3c692c99a02f35a54f7f	04-Sep-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Debugging functions for feature negotiation Since all feature-negotiation processing now takes place in feat.c, functions for producing verbose debugging output are concentrated there. New functions to print out values, entry records, and options are provided, and also a macro is defined to not always have the function name in the output line. Thanks a lot to Wei Yongjun and Giuseppe Galeota for help with errors in an earlier revision of this patch. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
0a4822679d94e2b0117aeead06a19fad59533905	04-Sep-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Initialisation and type-checking of feature sysctls This patch takes care of initialising and type-checking sysctls related to feature negotiation. Type checking is important since some of the sysctls now directly act on the feature-negotiation process. The sysctls are initialised with the known default values for each feature. For the type-checking the value constraints from RFC 4340 are used: * Sequence Window uses the specified Wmin=32, the maximum is ulong (4 bytes), tested and confirmed that it works up to 4294967295 - for Gbps speed; * Ack Ratio is between 0 .. 0xffff (2-byte unsigned integer); * CCIDs are between 0 .. 255; * request_retries, retries1, retries2 also between 0..255 for good measure; * tx_qlen is checked to be non-negative; * sync_ratelimit remains as before. Further changes: ---------------- Performed s@sysctl_dccp_feat@sysctl_dccp@g since the sysctls are now in feat.c. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
51c7d4fa2675c106a980ddcdbe308b54b5151945	04-Sep-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Implement both feature-local and feature-remote Sequence Window feature This adds full support for local/remote Sequence Window feature, from which the * sequence-number-validity (W) and * acknowledgment-number-validity (W') windows derive as specified in RFC 4340, 7.5.3. Specifically, the following changes are introduced: * integrated new socket fields into dccp_sk; * updated the update_gsr/gss routines with regard to these fields; * updated handler code: the Sequence Window feature is located at the TX side, so the local feature is meant if the handler-rx flag is false; * the initialisation of `rcv_wnd' in reqsk is removed, since - rcv_wnd is not used by the code anywhere; - sequence number checks are not done in the LISTEN state (cf. 7.5.3); - dccp_check_req checks the Ack number validity more rigorously; * the `struct dccp_minisock' became empty and is now removed. Until the handshake completes with activating negotiated values, the local/remote Sequence-Window values are undefined and thus can not reliably be estimated. This issue is addressed in a separate patch. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
09856c108956c99088ead9267ccbd1dab77f7043	04-Sep-2008	Gerrit Renker <gerrit@erg.abdn.ac.uk>	dccp: Auto-load (when supported) CCID plugins for negotiation This adds auto-loading of CCIDs (when module loading is enabled) for the purpose of feature negotiation. The problem with loading the CCIDs at the end of feature negotiation is that this would happen in software interrupt context. Besides, if the host advertises CCIDs during negotiation, it should have them ready to use, in case an agreeing peer wants to use it for the connection. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz>