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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2007-12-13 23:37:55 -0200
committerDavid S. Miller <davem@davemloft.net>2008-01-28 14:57:59 -0800
commit6179983ad30c43313e153b35af52bd9ebd7745c3 (patch)
tree1b1fcbad582d7aef0505910bdbfecaf833726357 /net/dccp/ccid.h
parent[CCID]: More informative registration (diff)
downloadlinux-dev-6179983ad30c43313e153b35af52bd9ebd7745c3.tar.xz
linux-dev-6179983ad30c43313e153b35af52bd9ebd7745c3.zip
[DCCP]: Introducing CCMPS
This introduces a CCMPS field for setting a CCID-specific upper bound on the application payload size, as is defined in RFC 4340, section 14. Only the TX CCID is considered in setting this limit, since the RX CCID generates comparatively small (DCCP-Ack) feedback packets. The CCMPS field includes network and transport layer header lengths. The only current CCMPS customer is CCID4 (via RFC 4828). A wrapper is used to allow querying the CCMPS even at times where the CCID modules may not have been fully negotiated yet. In dccp_sync_mss() the variable `mss_now' has been renamed into `cur_mps', to reflect that we are dealing with an MPS, but not an MSS. Since the DCCP code closely follows the TCP code, the identifiers `dccp_sync_mss' and `dccps_mss_cache' have been kept, as they have direct TCP counterparts. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dccp/ccid.h')
-rw-r--r--net/dccp/ccid.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/dccp/ccid.h b/net/dccp/ccid.h
index e3cdd8afc801..fdeae7b57319 100644
--- a/net/dccp/ccid.h
+++ b/net/dccp/ccid.h
@@ -27,6 +27,7 @@ struct tcp_info;
* struct ccid_operations - Interface to Congestion-Control Infrastructure
*
* @ccid_id: numerical CCID ID (up to %CCID_MAX, cf. table 5 in RFC 4340, 10.)
+ * @ccid_ccmps: the CCMPS including network/transport headers (0 when disabled)
* @ccid_name: alphabetical identifier string for @ccid_id
* @ccid_owner: module which implements/owns this CCID
* @ccid_hc_{r,t}x_slab: memory pool for the receiver/sender half-connection
@@ -45,6 +46,7 @@ struct tcp_info;
*/
struct ccid_operations {
unsigned char ccid_id;
+ __u32 ccid_ccmps;
const char *ccid_name;
struct module *ccid_owner;
struct kmem_cache *ccid_hc_rx_slab,