From 0686a20b8a0e7a18faaae792a189f9e7a9aabf62 Mon Sep 17 00:00:00 2001 From: Edward Tomasz Napierala Date: Thu, 11 Sep 2014 20:01:57 +0000 Subject: [PATCH] Don't blindly assume the target agreed to transition to Full Feature Phase; if we got a Login Response PDU without the "T" bit set, try again with an empty request. This fixes interoperability with COMSTAR. Reviewed by: mav@ Tested by: mav@ MFC after: 1 week --- usr.sbin/iscsid/login.c | 40 +++++++++++++++++++++++++++++++--------- 1 file changed, 31 insertions(+), 9 deletions(-) diff --git a/usr.sbin/iscsid/login.c b/usr.sbin/iscsid/login.c index 13fca0a497f2..c0bef632292f 100644 --- a/usr.sbin/iscsid/login.c +++ b/usr.sbin/iscsid/login.c @@ -575,7 +575,7 @@ login_negotiate(struct connection *conn) struct pdu *request, *response; struct keys *request_keys, *response_keys; struct iscsi_bhs_login_response *bhslr; - int i; + int i, nrequests = 0; log_debugx("beginning operational parameter negotiation"); request = login_new_request(conn, BHSLR_STAGE_OPERATIONAL_NEGOTIATION); @@ -629,19 +629,41 @@ login_negotiate(struct connection *conn) response_keys->keys_names[i], response_keys->keys_values[i]); } - bhslr = (struct iscsi_bhs_login_response *)response->pdu_bhs; - if ((bhslr->bhslr_flags & BHSLR_FLAGS_TRANSIT) == 0) - log_warnx("received final login response " - "without the \"T\" flag"); - else if (login_nsg(response) != BHSLR_STAGE_FULL_FEATURE_PHASE) + keys_delete(response_keys); + response_keys = NULL; + + for (;;) { + bhslr = (struct iscsi_bhs_login_response *)response->pdu_bhs; + if ((bhslr->bhslr_flags & BHSLR_FLAGS_TRANSIT) != 0) + break; + + nrequests++; + if (nrequests > 5) { + log_warnx("received login response " + "without the \"T\" flag too many times; giving up"); + break; + } + + log_debugx("received login response " + "without the \"T\" flag; sending another request"); + + pdu_delete(response); + + request = login_new_request(conn, + BHSLR_STAGE_OPERATIONAL_NEGOTIATION); + pdu_send(request); + pdu_delete(request); + + response = login_receive(conn); + } + + if (login_nsg(response) != BHSLR_STAGE_FULL_FEATURE_PHASE) log_warnx("received final login response with wrong NSG 0x%x", login_nsg(response)); + pdu_delete(response); log_debugx("operational parameter negotiation done; " "transitioning to Full Feature phase"); - - keys_delete(response_keys); - pdu_delete(response); } static void