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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2009-01-16 18:36:32 -0500
committerDavid S. Miller <davem@davemloft.net>2009-01-21 17:34:05 -0500
commit883ca833e5fb814fb03426c9d35e5489ce43e8da (patch)
treedcf361291b79e57195f8d89ca493c15c835b14cf /include/linux/dccp.h
parent792b48780e8b6435d017cef4b5c304876a48653e (diff)
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>
Diffstat (limited to 'include/linux/dccp.h')
-rw-r--r--include/linux/dccp.h8
1 files changed, 0 insertions, 8 deletions
diff --git a/include/linux/dccp.h b/include/linux/dccp.h
index 7a0502ab383a..7434a8353e23 100644
--- a/include/linux/dccp.h
+++ b/include/linux/dccp.h
@@ -355,14 +355,6 @@ static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
355 return __dccp_hdr_len(dccp_hdr(skb)); 355 return __dccp_hdr_len(dccp_hdr(skb));
356} 356}
357 357
358
359/* initial values for each feature */
360#define DCCPF_INITIAL_SEQUENCE_WINDOW 100
361#define DCCPF_INITIAL_ACK_RATIO 2
362#define DCCPF_INITIAL_CCID DCCPC_CCID2
363/* FIXME: for now we're default to 1 but it should really be 0 */
364#define DCCPF_INITIAL_SEND_NDP_COUNT 1
365
366/** 358/**
367 * struct dccp_request_sock - represent DCCP-specific connection request 359 * struct dccp_request_sock - represent DCCP-specific connection request
368 * @dreq_inet_rsk: structure inherited from 360 * @dreq_inet_rsk: structure inherited from