]> CyberLeo.Net >> Repos - FreeBSD/stable/10.git/blob - sys/cam/ctl/ctl_tpc_local.c
MFC r357212: libfetch: fix urldecode buffer overrun
[FreeBSD/stable/10.git] / sys / cam / ctl / ctl_tpc_local.c
1 /*-
2  * Copyright (c) 2014 Alexander Motin <mav@FreeBSD.org>
3  * Copyright (c) 2004, 2005 Silicon Graphics International Corp.
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer,
11  *    without modification, immediately at the beginning of the file.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26  */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/kernel.h>
34 #include <sys/types.h>
35 #include <sys/lock.h>
36 #include <sys/module.h>
37 #include <sys/mutex.h>
38 #include <sys/condvar.h>
39 #include <sys/malloc.h>
40 #include <sys/conf.h>
41 #include <sys/queue.h>
42 #include <sys/sysctl.h>
43
44 #include <cam/cam.h>
45 #include <cam/scsi/scsi_all.h>
46 #include <cam/scsi/scsi_da.h>
47 #include <cam/ctl/ctl_io.h>
48 #include <cam/ctl/ctl.h>
49 #include <cam/ctl/ctl_frontend.h>
50 #include <cam/ctl/ctl_util.h>
51 #include <cam/ctl/ctl_backend.h>
52 #include <cam/ctl/ctl_ioctl.h>
53 #include <cam/ctl/ctl_ha.h>
54 #include <cam/ctl/ctl_private.h>
55 #include <cam/ctl/ctl_debug.h>
56 #include <cam/ctl/ctl_scsi_all.h>
57 #include <cam/ctl/ctl_tpc.h>
58 #include <cam/ctl/ctl_error.h>
59
60 struct tpcl_softc {
61         struct ctl_port port;
62         int cur_tag_num;
63 };
64
65 static struct tpcl_softc tpcl_softc;
66
67 static int tpcl_init(void);
68 static int tpcl_shutdown(void);
69 static void tpcl_datamove(union ctl_io *io);
70 static void tpcl_done(union ctl_io *io);
71
72
73 static struct ctl_frontend tpcl_frontend =
74 {
75         .name = "tpc",
76         .init = tpcl_init,
77         .shutdown = tpcl_shutdown,
78 };
79 CTL_FRONTEND_DECLARE(ctltpc, tpcl_frontend);
80
81 static int
82 tpcl_init(void)
83 {
84         struct tpcl_softc *tsoftc = &tpcl_softc;
85         struct ctl_port *port;
86         struct scsi_transportid_spi *tid;
87         int error, len;
88
89         memset(tsoftc, 0, sizeof(*tsoftc));
90
91         port = &tsoftc->port;
92         port->frontend = &tpcl_frontend;
93         port->port_type = CTL_PORT_INTERNAL;
94         port->num_requested_ctl_io = 100;
95         port->port_name = "tpc";
96         port->fe_datamove = tpcl_datamove;
97         port->fe_done = tpcl_done;
98         port->max_targets = 1;
99         port->max_target_id = 0;
100         port->targ_port = -1;
101         port->max_initiators = 1;
102
103         if ((error = ctl_port_register(port)) != 0) {
104                 printf("%s: tpc port registration failed\n", __func__);
105                 return (error);
106         }
107
108         len = sizeof(struct scsi_transportid_spi);
109         port->init_devid = malloc(sizeof(struct ctl_devid) + len,
110             M_CTL, M_WAITOK | M_ZERO);
111         port->init_devid->len = len;
112         tid = (struct scsi_transportid_spi *)port->init_devid->data;
113         tid->format_protocol = SCSI_TRN_SPI_FORMAT_DEFAULT | SCSI_PROTO_SPI;
114         scsi_ulto2b(0, tid->scsi_addr);
115         scsi_ulto2b(port->targ_port, tid->rel_trgt_port_id);
116
117         ctl_port_online(port);
118         return (0);
119 }
120
121 static int
122 tpcl_shutdown(void)
123 {
124         struct tpcl_softc *tsoftc = &tpcl_softc;
125         struct ctl_port *port = &tsoftc->port;
126         int error;
127
128         ctl_port_offline(port);
129         if ((error = ctl_port_deregister(port)) != 0)
130                 printf("%s: tpc port deregistration failed\n", __func__);
131         return (error);
132 }
133
134 static void
135 tpcl_datamove(union ctl_io *io)
136 {
137         struct ctl_sg_entry *ext_sglist, *kern_sglist;
138         struct ctl_sg_entry ext_entry, kern_entry;
139         int ext_sg_entries, kern_sg_entries;
140         int ext_sg_start, ext_offset;
141         int len_to_copy;
142         int kern_watermark, ext_watermark;
143         struct ctl_scsiio *ctsio;
144         int i, j;
145
146         CTL_DEBUG_PRINT(("%s\n", __func__));
147
148         ctsio = &io->scsiio;
149
150         /*
151          * If this is the case, we're probably doing a BBR read and don't
152          * actually need to transfer the data.  This will effectively
153          * bit-bucket the data.
154          */
155         if (ctsio->ext_data_ptr == NULL)
156                 goto bailout;
157
158         /*
159          * To simplify things here, if we have a single buffer, stick it in
160          * a S/G entry and just make it a single entry S/G list.
161          */
162         if (ctsio->ext_sg_entries > 0) {
163                 int len_seen;
164
165                 ext_sglist = (struct ctl_sg_entry *)ctsio->ext_data_ptr;
166                 ext_sg_entries = ctsio->ext_sg_entries;
167                 ext_sg_start = 0;
168                 ext_offset = 0;
169                 len_seen = 0;
170                 for (i = 0; i < ext_sg_entries; i++) {
171                         if ((len_seen + ext_sglist[i].len) >=
172                              ctsio->ext_data_filled) {
173                                 ext_sg_start = i;
174                                 ext_offset = ctsio->ext_data_filled - len_seen;
175                                 break;
176                         }
177                         len_seen += ext_sglist[i].len;
178                 }
179         } else {
180                 ext_sglist = &ext_entry;
181                 ext_sglist->addr = ctsio->ext_data_ptr;
182                 ext_sglist->len = ctsio->ext_data_len;
183                 ext_sg_entries = 1;
184                 ext_sg_start = 0;
185                 ext_offset = ctsio->ext_data_filled;
186         }
187
188         if (ctsio->kern_sg_entries > 0) {
189                 kern_sglist = (struct ctl_sg_entry *)ctsio->kern_data_ptr;
190                 kern_sg_entries = ctsio->kern_sg_entries;
191         } else {
192                 kern_sglist = &kern_entry;
193                 kern_sglist->addr = ctsio->kern_data_ptr;
194                 kern_sglist->len = ctsio->kern_data_len;
195                 kern_sg_entries = 1;
196         }
197
198         kern_watermark = 0;
199         ext_watermark = ext_offset;
200         for (i = ext_sg_start, j = 0;
201              i < ext_sg_entries && j < kern_sg_entries;) {
202                 uint8_t *ext_ptr, *kern_ptr;
203
204                 len_to_copy = min(ext_sglist[i].len - ext_watermark,
205                                   kern_sglist[j].len - kern_watermark);
206
207                 ext_ptr = (uint8_t *)ext_sglist[i].addr;
208                 ext_ptr = ext_ptr + ext_watermark;
209                 if (io->io_hdr.flags & CTL_FLAG_BUS_ADDR) {
210                         /*
211                          * XXX KDM fix this!
212                          */
213                         panic("need to implement bus address support");
214 #if 0
215                         kern_ptr = bus_to_virt(kern_sglist[j].addr);
216 #endif
217                 } else
218                         kern_ptr = (uint8_t *)kern_sglist[j].addr;
219                 kern_ptr = kern_ptr + kern_watermark;
220
221                 if ((ctsio->io_hdr.flags & CTL_FLAG_DATA_MASK) ==
222                      CTL_FLAG_DATA_IN) {
223                         CTL_DEBUG_PRINT(("%s: copying %d bytes to user\n",
224                                          __func__, len_to_copy));
225                         CTL_DEBUG_PRINT(("%s: from %p to %p\n", __func__,
226                                          kern_ptr, ext_ptr));
227                         memcpy(ext_ptr, kern_ptr, len_to_copy);
228                 } else {
229                         CTL_DEBUG_PRINT(("%s: copying %d bytes from user\n",
230                                          __func__, len_to_copy));
231                         CTL_DEBUG_PRINT(("%s: from %p to %p\n", __func__,
232                                          ext_ptr, kern_ptr));
233                         memcpy(kern_ptr, ext_ptr, len_to_copy);
234                 }
235
236                 ctsio->ext_data_filled += len_to_copy;
237                 ctsio->kern_data_resid -= len_to_copy;
238
239                 ext_watermark += len_to_copy;
240                 if (ext_sglist[i].len == ext_watermark) {
241                         i++;
242                         ext_watermark = 0;
243                 }
244
245                 kern_watermark += len_to_copy;
246                 if (kern_sglist[j].len == kern_watermark) {
247                         j++;
248                         kern_watermark = 0;
249                 }
250         }
251
252         CTL_DEBUG_PRINT(("%s: ext_sg_entries: %d, kern_sg_entries: %d\n",
253                          __func__, ext_sg_entries, kern_sg_entries));
254         CTL_DEBUG_PRINT(("%s: ext_data_len = %d, kern_data_len = %d\n",
255                          __func__, ctsio->ext_data_len, ctsio->kern_data_len));
256
257 bailout:
258         io->scsiio.be_move_done(io);
259 }
260
261 static void
262 tpcl_done(union ctl_io *io)
263 {
264
265         tpc_done(io);
266 }
267
268 uint64_t
269 tpcl_resolve(struct ctl_softc *softc, int init_port,
270     struct scsi_ec_cscd *cscd, uint32_t *ss, uint32_t *ps, uint32_t *pso)
271 {
272         struct scsi_ec_cscd_id *cscdid;
273         struct ctl_port *port;
274         struct ctl_lun *lun;
275         uint64_t lunid = UINT64_MAX;
276
277         if (cscd->type_code != EC_CSCD_ID ||
278             (cscd->luidt_pdt & EC_LUIDT_MASK) != EC_LUIDT_LUN ||
279             (cscd->luidt_pdt & EC_NUL) != 0)
280                 return (lunid);
281
282         cscdid = (struct scsi_ec_cscd_id *)cscd;
283         mtx_lock(&softc->ctl_lock);
284         if (init_port >= 0)
285                 port = softc->ctl_ports[init_port];
286         else
287                 port = NULL;
288         STAILQ_FOREACH(lun, &softc->lun_list, links) {
289                 if (port != NULL &&
290                     ctl_lun_map_to_port(port, lun->lun) == UINT32_MAX)
291                         continue;
292                 if (lun->lun_devid == NULL)
293                         continue;
294                 if (scsi_devid_match(lun->lun_devid->data,
295                     lun->lun_devid->len, &cscdid->codeset,
296                     cscdid->length + 4) == 0) {
297                         lunid = lun->lun;
298                         if (ss && lun->be_lun)
299                                 *ss = lun->be_lun->blocksize;
300                         if (ps && lun->be_lun)
301                                 *ps = lun->be_lun->blocksize <<
302                                     lun->be_lun->pblockexp;
303                         if (pso && lun->be_lun)
304                                 *pso = lun->be_lun->blocksize *
305                                     lun->be_lun->pblockoff;
306                         break;
307                 }
308         }
309         mtx_unlock(&softc->ctl_lock);
310         return (lunid);
311 };
312
313 union ctl_io *
314 tpcl_alloc_io(void)
315 {
316         struct tpcl_softc *tsoftc = &tpcl_softc;
317
318         return (ctl_alloc_io(tsoftc->port.ctl_pool_ref));
319 };
320
321 int
322 tpcl_queue(union ctl_io *io, uint64_t lun)
323 {
324         struct tpcl_softc *tsoftc = &tpcl_softc;
325
326         io->io_hdr.nexus.initid = 0;
327         io->io_hdr.nexus.targ_port = tsoftc->port.targ_port;
328         io->io_hdr.nexus.targ_lun = lun;
329         io->scsiio.tag_num = atomic_fetchadd_int(&tsoftc->cur_tag_num, 1);
330         io->scsiio.ext_data_filled = 0;
331         return (ctl_queue(io));
332 }