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SCTP: Allow ADD_IP to work with AUTH for backward compatibility. 

This patch adds a tunable that will allow ADD_IP to work without
AUTH for backward compatibility.  The default value is off since
the default value for ADD_IP is off as well.  People who need
to use ADD-IP with older implementations take risks of connection
hijacking and should consider upgrading or turning this tunable on.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
This commit is contained in:
Vlad Yasevich 2007-10-24 17:24:26 -04:00
parent 88799fe5ec
commit 73d9c4fd1a
5 changed files with 21 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/sctp/structs.h
View File

@ -212,6 +212,7 @@ extern struct sctp_globals {
/* Flag to indicate if addip is enabled. */
int addip_enable;
int addip_noauth_enable;
/* Flag to indicate if PR-SCTP is enabled. */
int prsctp_enable;
@ -249,6 +250,7 @@ extern struct sctp_globals {
#define sctp_local_addr_list (sctp_globals.local_addr_list)
#define sctp_local_addr_lock (sctp_globals.addr_list_lock)
#define sctp_addip_enable (sctp_globals.addip_enable)
#define sctp_addip_noauth (sctp_globals.addip_noauth_enable)
#define sctp_prsctp_enable (sctp_globals.prsctp_enable)
#define sctp_auth_enable (sctp_globals.auth_enable)

8
net/sctp/associola.c
View File

@ -262,10 +262,14 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a
*/
asoc->peer.sack_needed = 1;
/* Assume that the peer recongizes ASCONF until reported otherwise
* via an ERROR chunk.
/* Assume that the peer will tell us if he recognizes ASCONF
* as part of INIT exchange.
* The sctp_addip_noauth option is there for backward compatibilty
* and will revert old behavior.
*/
asoc->peer.asconf_capable = 0;
if (sctp_addip_noauth)
asoc->peer.asconf_capable = 1;
/* Create an input queue. */
sctp_inq_init(&asoc->base.inqueue);

1
net/sctp/protocol.c
View File

@ -1179,6 +1179,7 @@ SCTP_STATIC __init int sctp_init(void)
/* Disable ADDIP by default. */
sctp_addip_enable = 0;
sctp_addip_noauth = 0;
/* Enable PR-SCTP by default. */
sctp_prsctp_enable = 1;

4
net/sctp/sm_make_chunk.c
View File

@ -2137,8 +2137,10 @@ int sctp_process_init(struct sctp_association *asoc, sctp_cid_t cid,
/* If the peer claims support for ADD-IP without support
* for AUTH, disable support for ADD-IP.
* Do this only if backward compatible mode is turned off.
*/
if (asoc->peer.asconf_capable && !asoc->peer.auth_capable) {
if (!sctp_addip_noauth &&
(asoc->peer.asconf_capable && !asoc->peer.auth_capable)) {
asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP |
SCTP_PARAM_DEL_IP |
SCTP_PARAM_SET_PRIMARY);

9
net/sctp/sysctl.c
View File

@ -263,6 +263,15 @@ static ctl_table sctp_table[] = {
.proc_handler = &proc_dointvec,
.strategy = &sysctl_intvec
},
{
.ctl_name = CTL_UNNUMBERED,
.procname = "addip_noauth_enable",
.data = &sctp_addip_noauth,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec,
.strategy = &sysctl_intvec
},
{ .ctl_name = 0 }
};