1
linux/net
Gerrit Renker 9eca0a47de 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>
2008-11-12 00:48:44 -08:00
..
9p net/9p: fix printk format warnings 2008-11-05 13:19:07 -06:00
802 net: '&' redux 2008-11-03 18:21:05 -08:00
8021q Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-11-11 15:43:02 -08:00
appletalk net: '&' redux 2008-11-03 18:21:05 -08:00
atm net: struct device - replace bus_id with dev_name(), dev_set_name() 2008-11-10 13:55:14 -08:00
ax25 net: '&' redux 2008-11-03 18:21:05 -08:00
bluetooth net: struct device - replace bus_id with dev_name(), dev_set_name() 2008-11-10 13:55:14 -08:00
bridge net: '&' redux 2008-11-03 18:21:05 -08:00
can net: Remove CONFIG_KMOD from net/ (towards removing CONFIG_KMOD entirely) 2008-10-16 15:24:51 -07:00
core net: remove struct neigh_table::pde 2008-11-11 16:47:44 -08:00
dccp dccp: Resolve dependencies of features on choice of CCID 2008-11-12 00:48:44 -08:00
decnet net: remove struct dst_entry::entry_size 2008-11-11 17:25:22 -08:00
dsa Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-11-11 15:43:02 -08:00
econet
ethernet dsa: add support for Trailer tagging format 2008-10-08 17:24:16 -07:00
ieee80211 wireless: fix two bad print_ssid conversions 2008-11-10 15:17:33 -05:00
ipv4 net: remove struct dst_entry::entry_size 2008-11-11 17:25:22 -08:00
ipv6 net: remove struct dst_entry::entry_size 2008-11-11 17:25:22 -08:00
ipx net: '&' redux 2008-11-03 18:21:05 -08:00
irda net: '&' redux 2008-11-03 18:21:05 -08:00
iucv iucv: Fix mismerge again. 2008-09-30 03:03:35 -07:00
key af_key: mark policy as dead before destroying 2008-11-06 23:08:37 -08:00
lapb
llc net: '&' redux 2008-11-03 18:21:05 -08:00
mac80211 mac80211: fix a buffer overrun in station debug code 2008-11-10 21:37:39 -08:00
netfilter Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-11-11 15:43:02 -08:00
netlabel net: replace NIPQUAD() in net/*/ 2008-10-31 00:54:56 -07:00
netlink netlink: constify struct nlattr * arg to parsing functions 2008-10-28 11:59:11 -07:00
netrom net: '&' redux 2008-11-03 18:21:05 -08:00
packet
phonet Phonet: use net_device built-in stats for GPRS 2008-11-10 16:21:05 -08:00
rfkill net: struct device - replace bus_id with dev_name(), dev_set_name() 2008-11-10 13:55:14 -08:00
rose net: '&' redux 2008-11-03 18:21:05 -08:00
rxrpc net: replace NIPQUAD() in net/*/ 2008-10-31 00:54:56 -07:00
sched pkt_sched: Control group classifier 2008-11-07 22:56:00 -08:00
sctp net: '&' redux 2008-11-03 18:21:05 -08:00
sunrpc sunrpc: Fix build warning due to typo in %pI4 format changes. 2008-11-02 23:57:06 -08:00
tipc tipc: trivial endian annotation in debug statement 2008-11-07 23:37:50 -08:00
unix Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-11-11 15:43:02 -08:00
wanrouter
wireless net: struct device - replace bus_id with dev_name(), dev_set_name() 2008-11-10 13:55:14 -08:00
x25 net: '&' redux 2008-11-03 18:21:05 -08:00
xfrm Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-11-06 22:43:03 -08:00
compat.c
Kconfig netns: Coexist with the sysfs limitations v2 2008-10-27 17:51:47 -07:00
Makefile net: Distributed Switch Architecture protocol support 2008-10-08 17:15:19 -07:00
nonet.c
socket.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-11-06 22:43:03 -08:00
sysctl_net.c
TUNABLE