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[SCTP]: Tie ADD-IP and AUTH functionality as required by spec.

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ADD-IP spec requires AUTH. It is, in fact, dangerous without AUTH.
So, disable ADD-IP functionality if the peer claims to support
ADD-IP, but not AUTH.

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 2007-09-16 19:35:39 -07:00 committed by David S. Miller
parent 65b07e5d0d
commit 6b2f9cb64d
2 changed files with 13 additions and 1 deletions
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1
include/net/sctp/structs.h
View File

@ -1543,6 +1543,7 @@ struct sctp_association {
__u8 asconf_capable; /* Does peer support ADDIP? */ __u8 asconf_capable; /* Does peer support ADDIP? */
__u8 prsctp_capable; /* Can peer do PR-SCTP? */ __u8 prsctp_capable; /* Can peer do PR-SCTP? */
__u8 auth_capable; /* Is peer doing SCTP-AUTH? */ __u8 auth_capable; /* Is peer doing SCTP-AUTH? */
__u8 addip_capable; /* Can peer do ADD-IP */
__u32 adaptation_ind; /* Adaptation Code point. */ __u32 adaptation_ind; /* Adaptation Code point. */

13
net/sctp/sm_make_chunk.c
View File

@ -1851,7 +1851,8 @@ static void sctp_process_ext_param(struct sctp_association *asoc,
break; break;
case SCTP_CID_ASCONF: case SCTP_CID_ASCONF:
case SCTP_CID_ASCONF_ACK: case SCTP_CID_ASCONF_ACK:
/* don't need to do anything for ASCONF */ asoc->peer.addip_capable = 1;
break;
default: default:
break; break;
} }
@ -2137,6 +2138,16 @@ int sctp_process_init(struct sctp_association *asoc, sctp_cid_t cid,
!asoc->peer.peer_hmacs)) !asoc->peer.peer_hmacs))
asoc->peer.auth_capable = 0; asoc->peer.auth_capable = 0;
/* If the peer claims support for ADD-IP without support
* for AUTH, disable support for ADD-IP.
*/
if (asoc->peer.addip_capable && !asoc->peer.auth_capable) {
asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP |
SCTP_PARAM_DEL_IP |
SCTP_PARAM_SET_PRIMARY);
}
/* Walk list of transports, removing transports in the UNKNOWN state. */ /* Walk list of transports, removing transports in the UNKNOWN state. */
list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
transport = list_entry(pos, struct sctp_transport, transports); transport = list_entry(pos, struct sctp_transport, transports);