From 73d9c4fd1a6ec4950b2eac8135d35506bf400d6c Mon Sep 17 00:00:00 2001 From: Vlad Yasevich Date: Wed, 24 Oct 2007 17:24:26 -0400 Subject: 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 --- net/sctp/associola.c | 8 ++++++-- net/sctp/protocol.c | 1 + net/sctp/sm_make_chunk.c | 4 +++- net/sctp/sysctl.c | 9 +++++++++ 4 files changed, 19 insertions(+), 3 deletions(-) (limited to 'net/sctp') diff --git a/net/sctp/associola.c b/net/sctp/associola.c index eaad5c5535a8..013e3d3ab0f1 100644 --- a/net/sctp/associola.c +++ b/net/sctp/associola.c @@ -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); diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c index 40c1a47d1b8d..ecfab0344e73 100644 --- a/net/sctp/protocol.c +++ b/net/sctp/protocol.c @@ -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; diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c index 2ff3a3df049d..43e8de1228f9 100644 --- a/net/sctp/sm_make_chunk.c +++ b/net/sctp/sm_make_chunk.c @@ -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); diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c index 0669778e4335..da4f15734fb1 100644 --- a/net/sctp/sysctl.c +++ b/net/sctp/sysctl.c @@ -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 } }; -- cgit v1.2.2