/* * Copyright (C) 2010 Michael Brown . * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of the * License, or any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA. * * You can also choose to distribute this program under the terms of * the Unmodified Binary Distribution Licence (as given in the file * COPYING.UBDL), provided that you have satisfied its requirements. */ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); #include #include #include #include #include #include #include #include #include #include #include /** @file * * Fibre Channel name server lookups * */ /** A Fibre Channel name server query */ struct fc_ns_query { /** Reference count */ struct refcnt refcnt; /** Fibre Channel exchange */ struct interface xchg; /** Fibre Channel peer */ struct fc_peer *peer; /** Fibre Channel port */ struct fc_port *port; /** Process */ struct process process; /** Success handler * * @v peer Fibre Channel peer * @v port Fibre Channel port * @v peer_port_id Peer port ID * @ret rc Return status code */ int ( * done ) ( struct fc_peer *peer, struct fc_port *port, struct fc_port_id *peer_port_id ); }; /** * Free name server query * * @v refcnt Reference count */ static void fc_ns_query_free ( struct refcnt *refcnt ) { struct fc_ns_query *query = container_of ( refcnt, struct fc_ns_query, refcnt ); fc_peer_put ( query->peer ); fc_port_put ( query->port ); free ( query ); } /** * Close name server query * * @v query Name server query * @v rc Reason for close */ static void fc_ns_query_close ( struct fc_ns_query *query, int rc ) { /* Stop process */ process_del ( &query->process ); /* Shut down interfaces */ intf_shutdown ( &query->xchg, rc ); } /** * Receive name server query response * * @v query Name server query * @v iobuf I/O buffer * @v meta Data transfer metadata * @ret rc Return status code */ static int fc_ns_query_deliver ( struct fc_ns_query *query, struct io_buffer *iobuf, struct xfer_metadata *meta __unused ) { union fc_ns_response *resp = iobuf->data; struct fc_port_id *peer_port_id; int rc; /* Sanity check */ if ( iob_len ( iobuf ) < sizeof ( resp->ct ) ) { DBGC ( query, "FCNS %p received underlength response (%zd " "bytes)\n", query, iob_len ( iobuf ) ); rc = -EINVAL; goto done; } /* Handle response */ switch ( ntohs ( resp->ct.code ) ) { case FC_GS_ACCEPT: if ( iob_len ( iobuf ) < sizeof ( resp->gid_pn ) ) { DBGC ( query, "FCNS %p received underlength accept " "response (%zd bytes)\n", query, iob_len ( iobuf ) ); rc = -EINVAL; goto done; } peer_port_id = &resp->gid_pn.port_id.port_id; DBGC ( query, "FCNS %p resolved %s to %s via %s\n", query, fc_ntoa ( &query->peer->port_wwn ), fc_id_ntoa ( peer_port_id ), query->port->name ); if ( ( rc = query->done ( query->peer, query->port, peer_port_id ) ) != 0 ) goto done; break; case FC_GS_REJECT: DBGC ( query, "FCNS %p rejected (reason %02x explanation " "%02x)\n", query, resp->reject.ct.reason, resp->reject.ct.explanation ); break; default: DBGC ( query, "FCNS %p received invalid response code %04x\n", query, ntohs ( resp->ct.code ) ); rc = -ENOTSUP; goto done; } rc = 0; done: free_iob ( iobuf ); fc_ns_query_close ( query, rc ); return rc; } /** * Name server query process * * @v query Name server query */ static void fc_ns_query_step ( struct fc_ns_query *query ) { struct xfer_metadata meta; struct fc_ns_gid_pn_request gid_pn; int xchg_id; int rc; /* Create exchange */ if ( ( xchg_id = fc_xchg_originate ( &query->xchg, query->port, &fc_gs_port_id, FC_TYPE_CT ) ) < 0 ) { rc = xchg_id; DBGC ( query, "FCNS %p could not create exchange: %s\n", query, strerror ( rc ) ); fc_ns_query_close ( query, rc ); return; } /* Construct query request */ memset ( &gid_pn, 0, sizeof ( gid_pn ) ); gid_pn.ct.revision = FC_CT_REVISION; gid_pn.ct.type = FC_GS_TYPE_DS; gid_pn.ct.subtype = FC_DS_SUBTYPE_NAME; gid_pn.ct.code = htons ( FC_NS_GET ( FC_NS_PORT_NAME, FC_NS_PORT_ID )); memcpy ( &gid_pn.port_wwn, &query->peer->port_wwn, sizeof ( gid_pn.port_wwn ) ); memset ( &meta, 0, sizeof ( meta ) ); meta.flags = XFER_FL_OVER; /* Send query */ if ( ( rc = xfer_deliver_raw_meta ( &query->xchg, &gid_pn, sizeof ( gid_pn ), &meta ) ) != 0){ DBGC ( query, "FCNS %p could not deliver query: %s\n", query, strerror ( rc ) ); fc_ns_query_close ( query, rc ); return; } } /** Name server exchange interface operations */ static struct interface_operation fc_ns_query_xchg_op[] = { INTF_OP ( xfer_deliver, struct fc_ns_query *, fc_ns_query_deliver ), INTF_OP ( intf_close, struct fc_ns_query *, fc_ns_query_close ), }; /** Name server exchange interface descriptor */ static struct interface_descriptor fc_ns_query_xchg_desc = INTF_DESC ( struct fc_ns_query, xchg, fc_ns_query_xchg_op ); /** Name server process descriptor */ static struct process_descriptor fc_ns_query_process_desc = PROC_DESC_ONCE ( struct fc_ns_query, process, fc_ns_query_step ); /** * Issue Fibre Channel name server query * * @v peer Fibre Channel peer * @v port Fibre Channel port * @ret rc Return status code */ int fc_ns_query ( struct fc_peer *peer, struct fc_port *port, int ( * done ) ( struct fc_peer *peer, struct fc_port *port, struct fc_port_id *peer_port_id ) ) { struct fc_ns_query *query; /* Allocate and initialise structure */ query = zalloc ( sizeof ( *query ) ); if ( ! query ) return -ENOMEM; ref_init ( &query->refcnt, fc_ns_query_free ); intf_init ( &query->xchg, &fc_ns_query_xchg_desc, &query->refcnt ); process_init ( &query->process, &fc_ns_query_process_desc, &query->refcnt ); query->peer = fc_peer_get ( peer ); query->port = fc_port_get ( port ); query->done = done; DBGC ( query, "FCNS %p querying %s via %s\n", query, fc_ntoa ( &query->peer->port_wwn ), port->name ); /* Mortalise self and return */ ref_put ( &query->refcnt ); return 0; }