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[SCTP]: Update ASCONF processing to conform to spec.

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The processing of the ASCONF chunks has changed a lot in the
spec.  New items are:
    1. A list of ASCONF-ACK chunks is now cached
    2. The source of the packet is used in response.
    3. New handling for unexpect ASCONF chunks.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Yasevich
2007-12-20 14:11:47 -08:00
committed by David S. Miller
parent ba8a06daed
commit a08de64d07
5 changed files with 143 additions and 44 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
include/net/sctp/structs.h
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@@ -744,6 +744,7 @@ struct sctp_chunk {
__u8 tsn_missing_report; /* Data chunk missing counter. */
__u8 data_accepted; /* At least 1 chunk in this packet accepted */
__u8 auth; /* IN: was auth'ed | OUT: needs auth */
__u8 has_asconf; /* IN: have seen an asconf before */
};
void sctp_chunk_hold(struct sctp_chunk *);
@@ -1785,20 +1786,16 @@ struct sctp_association {
*/
struct sctp_chunk *addip_last_asconf;
/* ADDIP Section 4.2 Upon reception of an ASCONF Chunk.
/* ADDIP Section 5.2 Upon reception of an ASCONF Chunk.
*
* IMPLEMENTATION NOTE: As an optimization a receiver may wish
* to save the last ASCONF-ACK for some predetermined period
* of time and instead of re-processing the ASCONF (with the
* same serial number) it may just re-transmit the
* ASCONF-ACK. It may wish to use the arrival of a new serial
* number to discard the previously saved ASCONF-ACK or any
* other means it may choose to expire the saved ASCONF-ACK.
* This is needed to implement itmes E1 - E4 of the updated
* spec. Here is the justification:
*
* [This is our saved ASCONF-ACK. We invalidate it when a new
* ASCONF serial number arrives.]
* Since the peer may bundle multiple ASCONF chunks toward us,
* we now need the ability to cache multiple ACKs. The section
* describes in detail how they are cached and cleaned up.
*/
struct sctp_chunk *addip_last_asconf_ack;
struct list_head asconf_ack_list;
/* These ASCONF chunks are waiting to be sent.
*
@@ -1947,6 +1944,11 @@ int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *,
struct sctp_cookie*,
gfp_t gfp);
int sctp_assoc_set_id(struct sctp_association *, gfp_t);
void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc);
struct sctp_chunk *sctp_assoc_lookup_asconf_ack(
const struct sctp_association *asoc,
__be32 serial);
int sctp_cmp_addr_exact(const union sctp_addr *ss1,
const union sctp_addr *ss2);