From 610ab73ac4cc8912fc253bbdc6d1f74bad3c8e3a Mon Sep 17 00:00:00 2001 From: Vlad Yasevich Date: Mon, 15 Jan 2007 19:18:30 -0800 Subject: [SCTP]: Correctly handle unexpected INIT-ACK chunk. Consider the chunk as Out-of-the-Blue if we don't have an endpoint. Otherwise discard it as before. Signed-off-by: Vlad Yasevich Signed-off-by: Sridhar Samudrala Signed-off-by: David S. Miller --- net/sctp/sm_statefuns.c | 22 ++++++++++++++++++++++ net/sctp/sm_statetable.c | 2 +- 2 files changed, 23 insertions(+), 1 deletion(-) (limited to 'net') diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c index 2c165dc9fb71..fce1f602cde2 100644 --- a/net/sctp/sm_statefuns.c +++ b/net/sctp/sm_statefuns.c @@ -1534,6 +1534,28 @@ sctp_disposition_t sctp_sf_do_5_2_2_dupinit(const struct sctp_endpoint *ep, } +/* + * Unexpected INIT-ACK handler. + * + * Section 5.2.3 + * If an INIT ACK received by an endpoint in any state other than the + * COOKIE-WAIT state, the endpoint should discard the INIT ACK chunk. + * An unexpected INIT ACK usually indicates the processing of an old or + * duplicated INIT chunk. +*/ +sctp_disposition_t sctp_sf_do_5_2_3_initack(const struct sctp_endpoint *ep, + const struct sctp_association *asoc, + const sctp_subtype_t type, + void *arg, sctp_cmd_seq_t *commands) +{ + /* Per the above section, we'll discard the chunk if we have an + * endpoint. If this is an OOTB INIT-ACK, treat it as such. + */ + if (ep == sctp_sk((sctp_get_ctl_sock()))->ep) + return sctp_sf_ootb(ep, asoc, type, arg, commands); + else + return sctp_sf_discard_chunk(ep, asoc, type, arg, commands); +} /* Unexpected COOKIE-ECHO handler for peer restart (Table 2, action 'A') * diff --git a/net/sctp/sm_statetable.c b/net/sctp/sm_statetable.c index 733dd87b3a7d..5f6cc7aa661b 100644 --- a/net/sctp/sm_statetable.c +++ b/net/sctp/sm_statetable.c @@ -152,7 +152,7 @@ const sctp_sm_table_entry_t *sctp_sm_lookup_event(sctp_event_t event_type, /* SCTP_STATE_EMPTY */ \ TYPE_SCTP_FUNC(sctp_sf_ootb), \ /* SCTP_STATE_CLOSED */ \ - TYPE_SCTP_FUNC(sctp_sf_discard_chunk), \ + TYPE_SCTP_FUNC(sctp_sf_do_5_2_3_initack), \ /* SCTP_STATE_COOKIE_WAIT */ \ TYPE_SCTP_FUNC(sctp_sf_do_5_1C_ack), \ /* SCTP_STATE_COOKIE_ECHOED */ \ -- cgit v1.2.3